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1<?xml version='1.0' encoding="UTF-8"?> 1<?xml version='1.0' encoding="UTF-8"?>
2<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/alsa-guide.xml,v 1.24 2003/12/31 09:51:41 neysx Exp $ --> 2<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/alsa-guide.xml,v 1.66 2006/05/01 05:52:31 fox2mike Exp $ -->
3
3<!DOCTYPE guide SYSTEM "/dtd/guide.dtd"> 4<!DOCTYPE guide SYSTEM "/dtd/guide.dtd">
4 5
5<guide link = "/doc/en/alsa-guide.xml"> 6<guide link="/doc/en/alsa-guide.xml">
6<title>Gentoo Linux ALSA Guide</title> 7<title>Gentoo Linux ALSA Guide</title>
8
7<author title="Author"> 9<author title="Author">
8 <mail link="zu@pandora.be">Vincent Verleye</mail> 10 <mail link="fox2mike@gentoo.org">Shyam Mani</mail>
9</author> 11</author>
10<author title="Author">
11 <mail link="g2boojum@gentoo.org">Grant Goodyear</mail>
12</author>
13<author title="Author">
14 <mail link="agenkin@gentoo.org">Arcady Genkin</mail>
15</author>
16<author title="Editor"><!-- zhen@gentoo.org -->
17 John P. Davis
18</author>
19<author title="Editor">
20 <mail link="swift@gentoo.org">Sven Vermeulen</mail>
21</author>
22<author title="Editor">
23 <mail link="bennyc@gentoo.org">Benny Chuang</mail>
24</author>
25<author title="Editor">
26 <mail link="blubber@gentoo.org">Tiemo Kieft</mail>
27</author>
28 12
13<abstract>
14This document helps a user setup ALSA on Gentoo Linux.
15</abstract>
16
17<!-- The content of this document is licensed under the CC-BY-SA license -->
18<!-- See http://creativecommons.org/licenses/by-sa/2.5 -->
29<license/> 19<license/>
30 20
31<abstract>
32This guide will show you how to set up the Advanced Linux Sound Architecture
33(ALSA) on Gentoo Linux. In addition to the Gentoo Linux Desktop Configuration
34Guide, this guide is supposed to give you more information on this subject.
35</abstract>
36
37<version>1.3.5</version> 21<version>2.12</version>
38<date>December 31, 2003</date> 22<date>2006-05-01</date>
39 23
40<chapter> 24<chapter>
41<title>Introduction</title> 25<title>Introduction</title>
42<section> 26<section>
43<title>What is ALSA?</title> 27<title>What is ALSA?</title>
44<body> 28<body>
45 29
46<p> 30<p>
47The Advanced Linux Sound Architecture (ALSA) is a project to improve the Linux 31ALSA, which stands for <e>Advanced Linux Sound Architecture</e>, provides
48sound subsystem by rewriting large chunks of it. It is anticipated that ALSA 32audio and MIDI (<e>Musical Instrument Digital Interface</e>) functionality to
49will make it into Linux kernel 2.6.x (or 3.x.x -- whichever comes first) as it 33the Linux operating system. ALSA is the default sound subsystem in the 2.6
50becomes ready. 34kernel thereby replacing OSS (<e>Open Sound System</e>), which was used in the
51</p> 352.4 kernels.
52
53<p> 36</p>
54ALSA provides audio and MIDI functionality for Linux. 37
55</p> 38<p>
56 39ALSA's main features include efficient support for all types of audio
40interfaces ranging from consumer sound cards to professional sound
41equipment, fully modularized drivers, SMP and thread safety, backward
42compatibility with OSS and a user-space library <c>alsa-lib</c> to make
43application development a breeze.
57<p> 44</p>
58Quoted from <uri>http://www.alsa-project.org</uri>, ALSA has the following 45
59features: 46</body>
47</section>
48<section>
49<title>ALSA on Gentoo</title>
50<body>
51
52<p>
53One of Gentoo's main strengths lies in giving the user maximum control over
54how a system is installed/configured. ALSA on Gentoo follows the same
55principle. There are two ways you can get ALSA support up and running on your
56system. We shall look at them in detail in the next chapter.
57</p>
58
59</body>
60</section>
61</chapter>
62
63<chapter>
64<title>Installing ALSA</title>
65<section>
66<title>Options</title>
67<body>
68
69<warn>
70The methods shown below are mutually exclusive. You cannot have ALSA compiled
71in your kernel and use <c>media-sound/alsa-driver</c>. It <e>will</e> fail.
72</warn>
73
74<p>
75The two options are :
76</p>
77
78<ol>
79 <li>
80 Use ALSA provided by your kernel. This is the preferred/recommended
81 method.
82 </li>
83 <li>
84 Use Gentoo's <c>media-sound/alsa-driver</c> package.
85 </li>
86</ol>
87
88<p>
89We shall take a peek into both before finally deciding on one.
90</p>
91
92<p>
93If you were to use ALSA provided by the kernel, the following are the pros and
94cons :
95</p>
96
97<table>
98<tr>
99 <th>Kernel ALSA</th>
100 <th>Pros and Cons</th>
101</tr>
102<tr>
103 <th>+</th>
104 <ti>Pretty stable as drivers are integrated into kernel.</ti>
105</tr>
106<tr>
107 <th>+</th>
108 <ti>One shot solution, no repeating emerges.</ti>
109</tr>
110<tr>
111 <th>-</th>
112 <ti>Might be a slightly older version than <c>alsa-driver</c>.</ti>
113</tr>
114</table>
115
116<p>
117And, if you were to use alsa-driver,
118</p>
119
120<table>
121<tr>
122 <th>alsa-driver</th>
123 <th>Pros and Cons</th>
124</tr>
125<tr>
126 <th>+</th>
127 <ti>Latest drivers from the ALSA Project.</ti>
128</tr>
129<tr>
130 <th>-</th>
131 <ti>Every kernel recompile requires a re-emerge of <c>alsa-driver</c>.</ti>
132</tr>
133<tr>
134 <th>-</th>
135 <ti>Needs certain kernel config options disabled to work correctly.</ti>
136</tr>
137</table>
138
139</body>
140</section>
141<section>
142<title>So...</title>
143<body>
144
145<p>
146The main difference between using <c>alsa-driver</c> and ALSA that comes with
147the kernel is that <c>alsa-driver</c> is generally more up to date than the
148version in the kernel. Since this does not make any huge difference as
149such, you are encouraged to use the ALSA provided by the kernel for ease of use.
150Before reporting any sound related issues to <uri
151link="https://bugs.gentoo.org">Gentoo Bugzilla</uri>, please try to reproduce
152them using <c>alsa-driver</c> and file the bug report no matter what the
153result.
154</p>
155
156</body>
157</section>
158<section id="lspci">
159<title>Before you proceed</title>
160<body>
161
162<p>
163Whichever method of install you choose, you need to know what drivers your
164sound card uses. In most cases, sound cards (onboard and otherwise) are PCI
165based and <c>lspci</c> will help you in digging out the required information.
166Please <c>emerge sys-apps/pciutils</c> to get <c>lspci</c>, if you don't have it
167installed already. In case you have a USB sound card, <c>lsusb</c> from
168<c>sys-apps/usbutils</c> <e>might</e> be of help. For ISA cards, try using
169<c>sys-apps/isapnptools</c>. Also, the following pages <e>may</e> help users
170with ISA based sound cards.
60</p> 171</p>
61 172
62<ul> 173<ul>
63 <li> 174 <li>
64 Efficient support for all types of audio interfaces, from consumer 175 <uri link="http://www.roestock.demon.co.uk/isapnptools/">The ISAPNPTOOLS
65 soundcards to professional multichannel audio interfaces 176 Page</uri>
66 </li>
67 <li>Fully modularized sound drivers</li>
68 <li>SMP and thread-safe design</li>
69 <li>
70 User space library (alsa-lib) to simplify application programming and
71 provide higher level functionality
72 </li>
73 <li>
74 Support for the older OSS API, providing binary compatibility for most OSS
75 programs
76 </li> 177 </li>
178 <li>
179 <uri link="http://www2.linuxjournal.com/article/3269">LinuxJournal PnP
180 Article</uri>
181 </li>
182 <li>
183 <uri link="http://www.tldp.org/HOWTO/Sound-HOWTO/x320.html">TLDP Sound
184 HowTo</uri>
185 </li>
77</ul> 186</ul>
78 187
79<p> 188<note>
80There's lots more to ALSA however, like support for Full Duplex playback and 189For ease of use/explanation, we assume the user has a PCI based sound card for
81recording, multiple soundcard support, hardware mixing of streams, extensive 190the remainder of this guide.
82mixer capabilities (to support advanced features of new soundcards), ... 191</note>
192
83</p> 193<p>
194We now proceed to find out details about the sound card.
195</p>
84 196
197<pre caption="Soundcard Details">
198# <i>lspci -v | grep -i audio</i>
1990000:00:0a.0 Multimedia audio controller: Creative Labs SB Live! EMU10k1 (rev 06)
200</pre>
201
202<p>
203We now know that the sound card on the machine is a Sound Blaster Live! and
204the card manufacturer is Creative Labs. Head over to the
205<uri link="http://www.alsa-project.org/alsa-doc/"> ALSA Soundcard Matrix</uri>
206page and select Creative Labs from the drop down menu. You will be taken to
207the Creative Labs matrix page where you can see that the SB Live! uses the
208<c>emu10k1</c> module. That is the information we need for now. If you are
209interested in detailed information, you can click on the link next to the
210"Details" and that will take you to the <c>emu10k1</c> specific page.
211</p>
212
85</body> 213</body>
86</section>
87<section> 214</section>
88<title>Why use ALSA?</title> 215<section id="kernel">
89<body> 216<title>Using ALSA provided by your Kernel</title>
90
91<p>
92If your soundcard is supported by the Linux kernel sound system or the
93commercial OSS/4Front sound driver system, which can be found in all 2.4.x
94Linux kernels, you could just aswell build <e>those modules</e> for use with
95your soundcard. If you want this, just read through the <uri
96link="http://www.tldp.org/HOWTO/Sound-HOWTO/index.html">Linux Sound HOWTO</uri>.
97</p>
98
99<p>
100However, those OSS/4Front drivers have some limitations -- being commercial is
101one. ALSA is an attempt to go beyond these limitations and to do so in an
102open-source fashion. ALSA is a fully GPL and LGPL'ed sound driver system, that
103provides a professional quality system for recording, playback, and MIDI
104sequencing.
105</p>
106
107</body> 217<body>
108</section> 218
219<p>
220If you're a person who likes to keep things simple like I do, then this is
221the way to go.
222</p>
223
224<note>
225Since the 2005.0 release, Gentoo Linux uses 2.6 as the default kernel. Unless
226you are specifically using the 2.4 profile, <c>gentoo-sources</c> will be a
2272.6 kernel on <e>most</e> architectures. Please check that your kernel is a
2282.6 series kernel. This method will <e>not</e> work on a 2.4 kernel.
229</note>
230
231<p>
232Let us now configure the kernel to enable ALSA.
233</p>
234
235<impo>
236<c>genkernel</c> users should now run <c>genkernel --menuconfig all</c> and
237then follow the instructions in <uri link="#doc_chap2_pre3">Kernel Options for
238ALSA</uri>.
239</impo>
240
241<pre caption="Heading over to the source">
242# <i>cd /usr/src/linux</i>
243# <i>make menuconfig</i>
244</pre>
245
246<note>
247The above example assumes that <path>/usr/src/linux</path> symlink points to
248the kernel sources you want to use. Please ensure the same before proceeding.
249</note>
250
251<p>
252Now we will look at some of the options we will have to enable in the 2.6
253kernel to ensure proper ALSA support for our sound card.
254</p>
255
256<p>
257Please note that for the sake of ease, all examples show ALSA built as modules.
258It is advisable to follow the same as it then allows the use of <c>alsaconf</c>
259which is a boon when you want to configure your card. Please do <e>not</e> skip
260the <uri link="#alsa-config">Configuration</uri> section of this document. If
261you still like to have options built-in, ensure that you make changes to your
262config accordingly.
263</p>
264
265<pre caption="Kernel Options for ALSA">
266Device Drivers ---&gt;
267 Sound ---&gt;
268
269<comment>(This needs to be enabled)</comment>
270&lt;M&gt; Sound card support
271
272<comment>(Make sure OSS is disabled)</comment>
273Open Sound System ---&gt;
274 &lt; &gt; Open Sound System (DEPRECATED)
275
276<comment>(Move one step back and enter ALSA)</comment>
277Advanced Linux Sound Architecture ---&gt;
278 &lt;M&gt; Advanced Linux Sound Architecture
279 <comment>(Select this if you want MIDI sequencing and routing)</comment>
280 &lt;M&gt; Sequencer support
281 <comment>(Old style /dev/mixer* and /dev/dsp* support. Recommended.)</comment>
282 &lt;M&gt; OSS Mixer API
283 &lt;M&gt; OSS PCM (digital audio) API
284
285<comment>(You now have a choice of devices to enable support for. Generally,
286you will have one type of device and not more. If you have more than one
287sound card, please enable them all here.)</comment>
288
289<comment>(Mostly for testing and development purposes, not needed for normal
290users unless you know what you are doing.)</comment>
291Generic devices ---&gt;
292
293<comment>(For ISA Sound cards)</comment>
294ISA devices ---&gt;
295<comment>(IF you had the Gravis, you would select this option)</comment>
296 &lt;M&gt; Gravis UltraSound Extreme
297
298<comment>(Move one level back and into PCI devices. Most sound cards today are
299PCI devices)</comment>
300PCI devices ---&gt;
301 <comment>(We now select the emu10k1 driver for our card)</comment>
302 &lt;M&gt; Emu10k1 (SB Live!, Audigy, E-mu APS)
303 <comment>(Or an Intel card would be)</comment>
304 &lt;M&gt; Intel/SiS/nVidia/AMD/ALi AC97 Controller
305 <comment>(Or if you have a VIA Card)</comment>
306 &lt;M&gt; VIA 82C686A/B, 8233/8235 AC97 Controller
307
308<comment>(Move one level back and select in case you have an USB sound card)</comment>
309USB Devices ---&gt;
310</pre>
311
312<p>
313Now that your options are set, you can (re)compile the kernel and ALSA support
314for your card should be functional once you reboot into the new kernel. Don't
315forget to update your GRUB configuration to use the newly built kernel.
316You can now proceed to <uri link="#alsa-utilities">ALSA Utilities</uri> and
317see if everything is working as it should.
318</p>
319
320</body>
109<section> 321</section>
110<title>What cards does ALSA support?</title> 322<section id="alsa-driver">
323<title>Using the ALSA Driver package</title>
111<body> 324<body>
112 325
113<p>
114ALSA tries to support as many (new) cards as possible by providing open-source
115drivers. However, some vendors may provide binary-only packages.
116</p> 326<p>
117 327So you've decided to go the <c>alsa-driver</c> way. Let's get started then.
328There are a few minor things to be done to ensure only the drivers for your
329sound card are compiled. Although this is not really necessary, it cuts down
330on the unnecessary drivers that will be compiled otherwise.
118<p> 331</p>
119To know if your card is supported, you can find a Soundcard Matrix of supported 332
120and not-supported cards here: <uri>http://www.alsa-project.org/alsa-doc/</uri>.
121</p> 333<p>
334If you don't have an idea of what drivers your sound card might need, please
335take a look at the <uri link="#lspci">lspci</uri> section of this guide. Once
336you have your driver name (<c>emu10k1</c> in our example), edit
337<path>/etc/make.conf</path> and add a variable, <c>ALSA_CARDS</c>.
338</p>
339
340<pre caption="Adding ALSA_CARDS to make.conf">
341<comment>(For one sound card)</comment>
342ALSA_CARDS="emu10k1"
343<comment>(For more than one, separate names with spaces)</comment>
344ALSA_CARDS="emu10k1 via82xx"
345</pre>
346
347<p>
348If you have compiled your kernel and want to use <c>alsa-driver</c>, please
349ensure the following before proceeding, else <c>alsa-driver</c> is likely to
350fail. The next code listing gives you one way of performing the checks.
351</p>
352
353<note>
354<c>genkernel</c> users can proceed with <uri link="#doc_chap2_pre6">Installing
355alsa-driver</uri> as their configuration is in sync with the one shown below by
356default.
357</note>
358
359<ol>
360 <li>
361 <c>CONFIG_SOUND</c> is set. (Basic Sound support enabled)
362 </li>
363 <li>
364 <c>CONFIG_SOUND_PRIME</c> is not set. (In-built OSS support disabled)
365 </li>
366 <li>
367 <c>CONFIG_SND</c> is not set. (In-built ALSA support disabled)
368 </li>
369 <li>
370 <path>/usr/src/linux</path> points to the kernel you want ALSA working on.
371 </li>
372</ol>
373
374<pre caption=".config checks">
375<comment>(Assuming the linux symlink points to the correct kernel)</comment>
376# <i>cd /usr/src/linux</i>
377# <i>grep SOUND .config</i>
378<comment>(1. is true)</comment>
379CONFIG_SOUND=y
380<comment>(2. is true)</comment>
381CONFIG_SOUND_PRIME is not set
382# <i>grep SND .config</i>
383<comment>(and 3. is true)</comment>
384CONFIG_SND is not set
385</pre>
386
387<p>
388Now all you have to do is type the magic words... and no, it's not abracadabra.
389</p>
390
391<pre caption="Installing alsa-driver">
392# <i>emerge alsa-driver</i>
393</pre>
394
395<impo>
396Please note that you will have to run <c>emerge alsa-driver</c> after every
397kernel (re)compile, as the earlier drivers are deleted.
398</impo>
122 399
123</body> 400</body>
124</section> 401</section>
125</chapter> 402</chapter>
126 403
127<chapter> 404<chapter>
128<title>Installation</title> 405<title>Configuring/Testing ALSA</title>
129<section> 406<section id="alsa-utilities">
130<title>Gentoo USE flags</title> 407<title>ALSA Utilities</title>
131<body>
132
133<p>
134To compile programs with ALSA-support, be sure to add <e>alsa</e> to
135your USE-variable. However, several tools don't support alsa yet, and
136require OSS. ALSA provides OSS-emulation if you define <e>oss</e> in your
137USE-variable before you start.
138</p>
139
140</body> 408<body>
141</section>
142<section>
143<title>Kernel modules</title>
144<body>
145 409
146<p>
147Since we're still using 2.4.x kernel sources, we'll have to compile kernel
148modules and ALSA modules separately. People who are using a 2.5.x kernel can
149do this from within their kernel configuration, since the ALSA modules are
150included in the kernel sources and should be built there.
151</p> 410<p>
152 411<c>alsa-utils</c> forms an integral part of ALSA as it has a truckload of
412programs that are highly useful, including the ALSA Initscripts. Hence we
413strongly recommend that you install <c>alsa-utils</c>
153<p> 414</p>
154First we'll make sure that our kernel configuration is ready for use with ALSA. 415
155All you need in your kernel configuration is having Sound Card Support set to 416<pre caption="Install alsa-utils">
156be built as a module (M). This will build <path>soundcore.o</path>. 417# <i>emerge alsa-utils</i>
157</p> 418</pre>
158 419
159<note> 420<note>
160Possibly, this will also work when you built Sound Card Support in the kernel 421If you activated ALSA in your <uri link="#kernel">kernel</uri> <e>and</e> did
161(Y) instead of building it as a module (M). However, the official ALSA 422not compile ALSA as modules, please proceed to the
162documentation suggests building it as a module, since ALSA will try loading it. 423<uri link="#initscript">ALSA Initscript</uri> section. The rest of you need
424to configure ALSA. This is made very easy by the existence of the
425<c>alsaconf</c> tool provided by <c>alsa-utils</c>.
163</note> 426</note>
164 427
165<p> 428</body>
166If you already have a working kernel configuration, make sure you remove all 429</section>
167sound drivers (except for Sound Card Support). If you wish to do this without 430<section id="alsa-config">
168having to reboot, you could do like this: 431<title>Configuration</title>
432<body>
433
434<note>
435Please shut down any programs that <e>might</e> access the sound card while
436running <c>alsaconf</c>.
437</note>
438
169</p> 439<p>
170 440The easiest way to configure your sound card is to run <c>alsaconf</c>. Just
171<pre caption="Kernel configuration"> 441type <c>alsaconf</c> in a shell as root.
172# <i>cd /usr/src/linux</i>
173# <i>cp .config ~/</i>
174# <i>make mrproper</i>
175# <i>cp ~/.config .</i>
176# <i>make menuconfig</i>
177</pre>
178
179<p> 442</p>
180Now select <e>Sound Card Support</e> as Module (M) and deselect all other sound 443
181drivers. Exit and say Y to save your kernel configuration. After that, build 444<pre caption="Invoking alsaconf">
182the modules: 445# <i>alsaconf</i>
446</pre>
447
183</p> 448<p>
184 449You will now see a neat menu guided interface that will automatically probe
185<pre caption="Kernel compilation"> 450your devices and try to find out your sound card. You will be asked to pick
186# <i>make dep clean</i> 451your sound card from a list. Once that's done, it will ask you permission to
187# <i>make modules modules_install</i> 452automatically make required changes to <path>/etc/modules.d/alsa</path>.
188</pre> 453It will then adjust your volume settings to optimum levels, run
189 454<c>modules-update</c> and start the <path>/etc/init.d/alsasound</path> service.
455Once <c>alsaconf</c> exits, you can proceed with setting up the ALSA
456initscript.
190<p> 457</p>
191Before installing your new modules, this last line will delete all your previous 458
192modules, even the ones from a previous ALSA installation. 459</body>
460</section>
461<section id="initscript">
462<title>ALSA Initscript</title>
463<body>
464
193</p> 465<p>
466We're now almost all setup. Whichever method you chose to install ALSA, you'll
467need to have something load your modules or initialize ALSA and restore your
468volume settings when your system comes up. The ALSA Initscript handles all of
469this for you and is called <c>alsasound</c>. Add it to the boot runlevel.
470</p>
471
472<pre caption="Adding ALSA to the boot runlevel">
473# <i>rc-update add alsasound boot</i>
474 * alsasound added to runlevel boot
475 * rc-update complete.
476</pre>
477
478<p>
479Next, just check the <path>/etc/conf.d/alsasound</path> file and ensure that
480SAVE_ON_STOP variable is set to yes. This saves your sound settings when you
481shutdown your system.
482</p>
483
484</body>
485</section>
486<section>
487<title>Audio Group</title>
488<body>
489
490<p>
491Before we move on to testing, there's one last <e>important</e> thing that needs
492to be setup. Rule of thumb in a *nix OS : Do not run as root unless needed.
493This applies here as well ;) How? Well, most of the times you should be logged
494in as a user and would like to listen to music or access your soundcard. For
495that to happen, you need to be in the "audio" group. At this point, we'll add
496users to the audio group, so that they won't have any issues when they want to
497access sound devices. We'll use <c>gpasswd</c> here and you need to be logged in
498as root for this to work.
499</p>
500
501<pre caption="Adding users to the audio group">
502<comment>(Substitute &lt;username&gt; with your user)</comment>
503# <i>gpasswd -a &lt;username&gt; audio </i>
504Adding user &lt;username&gt; to group audio
505</pre>
506
507</body>
508</section>
509<section>
510<title>Volume Check!</title>
511<body>
512
513<p>
514We've completed all the setups and pre-requisites, so let's fire up ALSA. If
515you ran <c>alsaconf</c>, you can skip this step, since <c>alsaconf</c> already
516does this for you.
517</p>
518
519<pre caption="Start the service">
520<comment>(ALSA as modules)</comment>
521# <i>/etc/init.d/alsasound start</i>
522 * Loading ALSA modules ...
523 * Loading: snd-card-0 ... [ ok ]
524 * Loading: snd-pcm-oss ... [ ok ]
525 * Loading: snd-seq ... [ ok ]
526 * Loading: snd-emu10k1-synth ... [ ok ]
527 * Loading: snd-seq-midi ... [ ok ]
528 * Restoring Mixer Levels ... [ ok ]
529<comment>(ALSA compiled in)</comment>
530# <i>/etc/init.d/alsasound start</i>
531 * Loading ALSA modules ...
532 * Restoring Mixer Levels ... [ ok ]
533</pre>
534
535<p>
536Now that the required things have been taken care of, we need to check up on
537the volume as in certain cases, it is muted. We use <c>alsamixer</c> for this
538purpose.
539</p>
540
541<pre caption="Starting alsamixer">
542<comment>(Opens up a console program. Only required settings are shown)</comment>
543# <i>alsamixer</i>
544</pre>
194 545
195<impo> 546<impo>
196This means, whenever you recompile your kernel later on, you MUST recompile 547If you have issues starting up <c>alsamixer</c> and get errors such as
197<c>alsa-driver</c>. 548alsamixer: function snd_ctl_open failed for default: No such file or directory,
549this is usually an issue with udev setting up the devices. Run <c>killall
550udevd; udevstart</c> to reload <path>/dev</path> entries and fire up
551<c>alsamixer</c>. It should solve the issue.
198</impo> 552</impo>
199 553
200</body>
201</section>
202<section>
203<title>ALSA modules</title>
204<body>
205
206<p>
207Now it's time to install the ALSA drivers for your soundcard(s). If your
208soundcard is PCI, you can find out the name and type of your soundcard by
209looking at the output of <path>/proc/pci</path>.
210</p> 554<p>
211 555This is how the ALSA Mixer <e>might</e> look the first time you open it. Pay
212<pre caption="Search for soundcard information"> 556attention to the Master and PCM channels which both have an MM below them.
213# <i>grep audio /proc/pci</i> 557That means they are muted. If you try to play anything with <c>alsamixer</c>
558in this state, you will not hear anything on your speakers.
214</pre> 559</p>
560
561<figure link="/images/docs/alsa-mixermuted.png" short="AlsaMixer Muted" caption="The Alsa Mixer Main Window, Muted"/>
562
563<p>
564Now, we shall unmute the channels, and set volume levels as needed.
565</p>
215 566
216<warn> 567<warn>
217If you had a previous sound setup and there are still non-ALSA sound modules 568Both Master <e>and</e> PCM need to be unmuted and set to audible volume levels
218loaded, unload them <e>now</e>. Check with <c>lsmod</c> and use <c>rmmod</c> 569if you want to hear some output on your speakers.
219to unload all sound-related modules on your system.
220</warn> 570</warn>
221 571
222<p> 572<ul>
223We could simply do an <c>emerge alsa-driver</c> now, this would compile and 573 <li>
224install <e>all</e> ALSA sound drivers. 574 To move between channels, use your left and right arrow keys. (&lt;-
225</p> 575 &amp; -&gt;)
226 576 </li>
227<p> 577 <li>
228However, to save some time, lookup the <e>Module Name</e> of your soundcard(s) 578 To toggle mute, move to the specific channel, for example Master and press
229on the <uri link="http://www.alsa-project.org/alsa-doc">ALSA Soundcard 579 the <e>m</e> key on the keyboard.
230Matrix</uri> by following the <e>Details</e> link in the <e>Driver and Docs</e> 580 </li>
231column in the row of the chipset of your soundcard. Mine is <c>snd-emu10k1</c>, 581 <li>
232since I have an SBlive! soundcard, with the <e>EMU10K1</e> chipset. We'll set 582 To increase and decrease the volume levels, use the up and down arrow keys
233ALSA_CARDS environment to the value of the module name before emerging (but 583 respectively.
234without the snd prefix), so emerge will only compile the drivers we need. 584 </li>
235</p> 585</ul>
236
237<pre caption="Compile correct modules">
238# <i>env ALSA_CARDS='emu10k1' emerge alsa-driver</i>
239</pre>
240 586
241<note> 587<note>
242You can also add this value in <path>/etc/make.conf</path>, so when you have 588Be careful when setting your Bass and Treble values. 50 is usually a good
243to emerge the alsa-driver later on you can just run <c>emerge alsa-driver</c>. 589number for both. Extremely high values of Bass may cause <e>jarring</e>
244For example, like this: <c>echo 'ALSA_CARDS="emu10k1"' >> /etc/make.conf</c> 590on speakers that are not designed to handle them.
245</note> 591</note>
246 592
593<p>
594After you're all done, your ALSA Mixer should look similar to the one below.
595Note the 00 instead of the MM and also the volume levels for some optimum
596settings.
597</p>
598
599<figure link="/images/docs/alsa-mixerunmuted.png" short="AlsaMixer Unmuted" caption="Alsa Mixer ready to roll"/>
600
601</body>
602</section>
603<section>
604<title>Sound Check!</title>
605<body>
606
607<p>
608Finally. Some music. If everything above is perfect, you should now be able to
609listen to some good music. A quick way to test is to use a command line tool
610like <c>media-sound/madplay</c>. You could also use something more well known
611like <c>mpg123</c> or <c>xmms</c>. If you are an ogg fan, you could use
612<c>ogg123</c> provided by <c>media-sound/vorbis-tools</c>. Use any player you
613are comfortable with. As always, <c>emerge</c> what you need.
614</p>
615
616<pre caption="Getting the software">
617<comment>(Install the applications you want)</comment>
618# <i>emerge madplay mpg123 xmms</i>
619<comment>(To play .ogg files)</comment>
620# <i>emerge vorbis-tools</i>
621</pre>
622
623<p>
624And then play your favorite sound track...
625</p>
626
627<pre caption="Playing Music">
628# <i>madplay -v /mnt/shyam/Music/Paul\ Oakenfold\ -\ Dread\ Rock.mp3</i>
629MPEG Audio Decoder 0.15.2 (beta) - Copyright (C) 2000-2004 Robert Leslie et al.
630 Title: Dread Rock
631 Artist: Paul Oakenfold
632 Album: Matrix Reloaded
633 Year: 2003
634 Genre: Soundtrack
635 Soundtrack
636 00:04:19 Layer III, 160 kbps, 44100 Hz, joint stereo (MS), no CRC
637
638# <i>ogg123 Paul\ Oakenfold\ -\ Dread\ Rock.ogg</i>
639Audio Device: Advanced Linux Sound Architecture (ALSA) output
640
641Playing: Paul Oakenfold - Dread Rock.ogg
642Ogg Vorbis stream: 2 channel, 44100 Hz
643Genre: Soundtrack
644Transcoded: mp3;160
645Title: Dread Rock
646Artist: Paul Oakenfold
647Date: 2003
648Album: Matrix Reloaded
649Time: 00:11.31 [04:28.75] of 04:40.06 (200.6 kbps) Output Buffer 96.9%
650</pre>
651
652</body>
653</section>
654<section>
655<title>ALSA and USE</title>
656<body>
657
658<p>
659You can now add the <c>alsa</c> use flag to <path>/etc/make.conf</path> to
660ensure that your applications that support ALSA get built with it. Some
661architectures like x86 and amd64 have the flag enabled by default.
662</p>
663
664</body>
665</section>
666<section>
667<title>Issues?</title>
668<body>
669
670<p>
671If for some reason you're unable to hear sound, the first thing to do would
672be to check your <uri link="#doc_chap3_pre6">alsamixer</uri> settings. 80% of
673the issues lie with muted channels or low volume. Also check your Window
674Manager's sound applet and verify that volumes are set to audible levels.
675</p>
676
677<p>
678<path>/proc</path> is your friend. And in this case, <path>/proc/asound</path>
679is your best friend. We shall just take a short look at how much info is made
680available to us there.
681</p>
682
683<pre caption="Fun with /proc/asound">
684<comment>(First and foremost, if /proc/asound/cards shows your card, ALSA has
685picked up your sound card fine.)</comment>
686# <i>cat /proc/asound/cards</i>
6870 [Live ]: EMU10K1 - Sound Blaster Live!
688 Sound Blaster Live! (rev.6, serial:0x80271102) at 0xb800, irq 11
689
690<comment>(If you run ALSA off the kernel like I do and wonder how far behind
691you are from alsa-driver, this displays current running ALSA version)</comment>
692# <i>cat /proc/asound/version</i>
693Advanced Linux Sound Architecture Driver Version 1.0.8 (Thu Jan 13 09:39:32 2005 UTC).
694
695<comment>(ALSA OSS emulation details)</comment>
696# <i>cat /proc/asound/oss/sndstat</i>
697Sound Driver:3.8.1a-980706 (ALSA v1.0.8 emulation code)
698Kernel: Linux airwolf.zion 2.6.11ac1 #2 Wed May 4 00:35:08 IST 2005 i686
699Config options: 0
700
701Installed drivers:
702Type 10: ALSA emulation
703
704Card config:
705Sound Blaster Live! (rev.6, serial:0x80271102) at 0xb800, irq 11
706
707Audio devices:
7080: EMU10K1 (DUPLEX)
709
710Synth devices: NOT ENABLED IN CONFIG
711
712Midi devices:
7130: EMU10K1 MPU-401 (UART)
714
715Timers:
7167: system timer
717
718Mixers:
7190: SigmaTel STAC9721/23
720</pre>
721
722<p>
723The other most common issue users face is the dreaded "Unknown symbol in module"
724error. An example of the same is shown below.
725</p>
726
727<pre caption="Unknown Symbol in module error">
728# <i>/etc/init.d/alsasound start</i>
729 * Loading ALSA modules ...
730 * Loading: snd-card-0 ... [ ok ]
731 * Loading: snd-pcm-oss ...
732WARNING: Error inserting snd_mixer_oss
733(/lib/modules/2.6.12-gentoo-r6/kernel/sound/core/oss/snd-mixer-oss.ko): Unknown
734symbol in module, or unknown parameter (see dmesg) FATAL: Error inserting
735snd_pcm_oss
736(/lib/modules/2.6.12-gentoo-r6/kernel/sound/core/oss/snd-pcm-oss.ko): Unknown
737symbol in module, or unknown parameter (see dmesg)
738 [ !! ]
739 * Loading: snd-mixer-oss ...
740FATAL: Error inserting snd_mixer_oss
741(/lib/modules/2.6.12-gentoo-r6/kernel/sound/core/oss/snd-mixer-oss.ko): Unknown
742symbol in module, or unknown parameter (see dmesg)
743 [ !! ]
744 * Loading: snd-seq ... [ ok ]
745 * Loading: snd-emu10k1-synth ... [ ok ]
746 * Loading: snd-seq-midi ... [ ok ]
747 * Restoring Mixer Levels ... [ ok ]
748</pre>
749
750<p>
751And when you take a look at <c>dmesg</c> as suggested, you're quite likely to
752see:
753</p>
754
755<pre caption="dmesg output">
756<comment>(Only relevant portions are shown below)</comment>
757# <i>dmesg | less</i>
758ACPI: PCI Interrupt 0000:02:06.0[A] -> Link [APC3] -> GSI 18 (level, low) -> IRQ 209
759snd_mixer_oss: Unknown symbol snd_unregister_oss_device
760snd_mixer_oss: Unknown symbol snd_register_oss_device
761snd_mixer_oss: Unknown symbol snd_mixer_oss_notify_callback
762snd_mixer_oss: Unknown symbol snd_oss_info_register
763snd_pcm_oss: Unknown symbol snd_unregister_oss_device
764snd_pcm_oss: Unknown symbol snd_register_oss_device
765snd_pcm_oss: Unknown symbol snd_mixer_oss_ioctl_card
766snd_pcm_oss: Unknown symbol snd_oss_info_register
767snd_mixer_oss: Unknown symbol snd_unregister_oss_device
768snd_mixer_oss: Unknown symbol snd_register_oss_device
769snd_mixer_oss: Unknown symbol snd_mixer_oss_notify_callback
770snd_mixer_oss: Unknown symbol snd_oss_info_register
771</pre>
772
773<p>
774The above issue is caused when you switch from <c>alsa-driver</c> to in-kernel
775ALSA because when you unmerge <c>alsa-driver</c> the module files are config
776protected and hence get left behind. So, when you switch to in-kernel
777drivers, running <c>modprobe</c> gives you a mix of <c>alsa-driver</c> and
778in-kernel modules thus causing the above errors.
779</p>
780
781<p>
782The solution is quite easy. We just need to manually remove the problem causing
783directory after you unmerge <c>alsa-driver</c>. Be sure to remove the correct
784kernel version and not the current one!
785</p>
786
787<pre caption="Removing the alsa-driver modules">
788<comment>(Replace KERNELVER with your kernel version)</comment>
789# <i>rm -rf /lib/modules/KERNELVER/alsa-driver</i>
790</pre>
791
792<p>
793Another reason for error messages similar to the ones above could be a file in
794<path>/etc/modules.d</path> supplying a <c>device_node</c> parameter when it
795isn't required. Confirm that this is indeed the issue and find out which file
796is the culprit.
797</p>
798
799<pre caption="Confirming and searching for device_node">
800<comment>(Check dmesg to confirm)</comment>
801# <i>dmesg | grep device_mode</i>
802snd: Unknown parameter `device_mode'
803<comment>(Now, to get to the source of the issue)</comment>
804# <i>grep device_mode /etc/modules.d/*</i>
805</pre>
806
807<p>
808Usually it is a file called <path>alsa</path> with the line <c>options snd
809device_mode=0666</c>. Remove this line and restart the alsasound service and
810that should take care of this issue.
811</p>
812
813</body>
814</section>
815</chapter>
816
817<chapter>
818<title>Other things ALSA</title>
819<section>
820<title>Setting up MIDI support</title>
821<body>
822
823<p>
824If your sound card is one of those that come with on-board MIDI synthesizers
825and you would like to listen to some .mid files, you have to install
826<c>awesfx</c> which is basically a set of utilities for controlling the AWE32
827driver. We need to install it first. If you don't have a hardware synthesizer,
828you can use a virtual one. Please see the section on
829<uri link="#vsynth">Virtual Synthesizers</uri> for more information.
830</p>
831
832<pre caption="Installing awesfx">
833# <i>emerge awesfx</i>
834</pre>
835
247<note> 836<note>
248When you want to install ALSA drivers for more than one soundcard, you could 837You will need to copy over SoundFont (SF2) files from your sound card's driver
249set ALSA_CARDS to a space-separated list of drivers; like this: <c>env 838CD or a Windows installation into <path>/usr/share/sounds/sf2/</path>. For
250ALSA_CARDS='emu10k1 intel8x0 ens1370' emerge alsa-driver</c> 839example a sound font file for the Creative SBLive! card would be 8MBGMSFX.SF2.
251</note> 840</note>
252 841
842<p>
843After copying over the Soundfont files, we can then play a midi file as shown.
844You can also add the <c>asfxload</c> command to
845<path>/etc/conf.d/local.start</path>, so that the sound font is loaded
846every time the system starts up.
847</p>
848
253<note> 849<note>
254If you want to have OSS compatibility, make sure to emerge <i>alsa-oss</i>, it 850<path>/mnt</path> paths mentioned in the code listing(s) below will <e>not</e>
255is the ALSA/OSS compatibility wrapper. 851be the same in your machine. They are just an example. Please be careful to
852change the path to suit your machine.
256</note> 853</note>
257 854
258<note> 855<pre caption="Loading Soundfonts">
259If you plan on recompiling your kernels numerous times, it might 856<comment>(First, copy the Soundfont)</comment>
260be adviseable to emerge <c>alsa-driver</c> with <c>--buildpkg</c>. This 857# <i>cp /mnt/win2k/Program\ Files/CreativeSBLive2k/SFBank/8MBGMSFX.SF2 /usr/share/sounds/sf2/</i>
261will create a binary package for it. Later, after recompiling your kernel, 858<comment>(Or get it from your SoundBlaster CD)</comment>
262you can just do <c>emerge --usepkg alsa-driver</c> which will install the 859# <i>cp /mnt/cdrom/AUDIO/ENGLISH/SFBANK/8MBGMSFX.SF2 /usr/share/sounds/sf2/</i>
263binary package instead of recompiling it completely. 860<comment>(We load the specific Soundfont)</comment>
264</note> 861# <i>asfxload /usr/share/sounds/sf2/8MBGMSFX.SF2</i>
862</pre>
265 863
266<p>
267After this, the ALSA modules should be installed on your system.
268</p> 864<p>
865You can now play midi files using a program like <c>aplaymidi</c>. Run
866<c>aplaymidi -l</c> to get a list of available ports and then pick one
867to play the file on.
868</p>
269 869
870<pre caption="Playing MIDI">
871<comment>(Check open ports)</comment>
872# <i>aplaymidi -l</i>
873 Port Client name Port name
874 64:0 EMU10K1 MPU-401 (UART) EMU10K1 MPU-401 (UART)
875 65:0 Emu10k1 WaveTable Emu10k1 Port 0
876 65:1 Emu10k1 WaveTable Emu10k1 Port 1
877 65:2 Emu10k1 WaveTable Emu10k1 Port 2
878 65:3 Emu10k1 WaveTable Emu10k1 Port 3
879<comment>(Pick a port, and play a mid file)</comment>
880# <i> aplaymidi --port=65:0 /mnt/shyam/music/midi/mi2.mid</i>
881</pre>
882
270</body> 883</body>
271</section>
272<section> 884</section>
273<title>Configuration of ALSA</title> 885<section id="vsynth">
274<body> 886<title>Virtual Synthesizers</title>
275
276<p>
277Let's start configuring now to get ALSA working properly. We'll need to edit
278some files, to let our system know about the freshly installed ALSA modules.
279</p>
280
281<p>
282First, install <c>alsa-utils</c> on your system:
283</p>
284
285<pre caption = "Emerging alsa-utils">
286# <i>emerge alsa-utils</i>
287</pre>
288
289<p>
290Hereafter, we need to edit <path>/etc/modules.d/alsa</path>.
291</p>
292
293<warn>
294There is no need to edit <path>/etc/modules.conf</path>. Instead, always edit
295files in <path>/etc/modules.d</path>.
296</warn>
297
298<p>
299Check the ALSA portion <e>at the bottom of the file</e>. By tweaking this line
300you can specify the max number of soundcards you have (generally, just one).
301</p>
302
303<pre caption="At the bottom of /etc/modules.d/alsa">
304<comment>Set this to the correct number of cards.</comment>
305options snd cards_limit=1
306</pre>
307
308<p>
309Now we'll specify the sounddriver(s) ALSA should use. In the same file, edit
310like this:
311</p>
312
313<pre caption="In /etc/modules.d/alsa">
314## and then run `modules-update' command.
315## Read alsa-driver's INSTALL file in /usr/share/doc for more info.
316##
317## ALSA portion
318alias snd-card-0 snd-emu10k1
319<comment>## If you have more than one, add:</comment>
320## alias snd-card-1 snd-intel8x0
321## alias snd-card-2 snd-ens1370
322## OSS/Free portion
323## alias sound-slot-0 snd-card-0
324## alias sound-slot-1 snd-card-1
325##
326</pre>
327
328<note>
329If you have more than one soundcard, adjust the <c>cards_limit</c> value and add
330more snd-card aliases to the file. I don't have experience with this, but you
331can find examples for configurations with two or more soundcards in <uri
332link="http://www.alsa-project.org/alsa-doc/alsa-howto/c1660.htm">Chapter 6</uri>
333of the <uri
334link="http://www.alsa-project.org/alsa-doc/alsa-howto/alsa-howto.html">ALSA
335Howto</uri>.
336</note>
337
338<p>
339Last thing to do in this file, almost at the end, check if these lines are there
340and uncommented:
341</p>
342
343<pre caption="Near the end of /etc/modules.d/alsa">
344alias /dev/mixer snd-mixer-oss
345alias /dev/dsp snd-pcm-oss
346alias /dev/midi snd-seq-oss
347</pre>
348
349<p>
350Now double-check the file <path>/etc/modules.d/alsa</path> and when you're sure
351everyting is ok, run <c>modules-update</c>.
352</p>
353
354<pre caption="Running modules-update">
355# <i>modules-update</i>
356</pre>
357
358<note>
359Running <c>modules-update</c> here will insert the data from
360<path>/etc/modules.d/alsa</path> into <path>/etc/modules.conf</path>
361</note>
362
363<p>
364You should also verify that <path>/etc/devfsd.conf</path> has the alsa devices
365and permissions correctly registered.
366</p>
367
368<pre caption="/etc/devfsd.conf">
369# ALSA/OSS stuff
370# Comment/change these if you want to change the permissions on
371# the audio devices
372LOOKUP snd MODLOAD ACTION snd
373LOOKUP dsp MODLOAD
374LOOKUP mixer MODLOAD
375LOOKUP midi MODLOAD
376REGISTER sound/.* PERMISSIONS root.audio 660
377REGISTER snd/.* PERMISSIONS root.audio 660
378</pre>
379
380<note>
381Notice that devfsd.conf sets <path>/dev/sound</path> permissions to be
382root.audio. Thus, for non-root users to use audio they will have to be part of
383the audio group.
384</note>
385
386</body> 887<body>
387</section>
388</chapter>
389 888
390<chapter> 889<p>
391<title>Starting ALSA</title> 890If your sound card lacks a hardware synthesizer, you could use a virtual one
891like <c>timidity++</c>. Installation is a breeze.
892</p>
893
894<pre caption="Installing timidity++">
895# <i>emerge timidity++</i>
896</pre>
897
898<p>
899For timidity to play sounds, it needs a sound font. If you do not have any,
900install <c>timidity-eawpatches</c> or <c>timidity-shompatches</c> which will
901give you some sound fonts. You can have multiple sound font configurations
902installed, and you can place your own in <path>/usr/share/timidity/</path>.
903To switch between different timidity configurations, you should use the
904<c>timidity-update</c> tool provided in the timidity++ package.
905</p>
906
907<pre caption="Installing sound fonts">
908# <i>emerge timidity-eawpatches</i>
909# <i>timidity-update -g -s eawpatches</i>
910
911<comment>(or)</comment>
912
913# <i>emerge timidity-shompatches</i>
914# <i>timidity-update -g -s shompatches</i>
915</pre>
916
917<p>
918Don't forget to add <c>timidity</c> to the default runlevel.
919</p>
920
921<pre caption="Adding timidity to the default runlevel">
922# <i>rc-update add timidity default</i>
923# <i>/etc/init.d/timidity start</i>
924</pre>
925
926<p>
927You can now try out <uri link="#doc_chap4_pre3">Playing MIDI</uri> files.
928</p>
929
930</body>
392<section> 931</section>
393<title>Adding alsasound to a runlevel</title>
394<body>
395
396<p>
397First thing to do now, is to make ALSA startup at boottime. Like this:
398</p>
399
400<pre caption="Add ALSA to the boot runlevel">
401# <i>rc-update add alsasound boot</i>
402</pre>
403
404<warn>
405Note that the alsasound script should be added to the "boot" runlevel, not the
406"default" runlevel.
407</warn>
408
409</body>
410</section> 932<section>
933<title>Tools and Firmware</title>
934<body>
935
936<p>
937Some specific sound cards can benefit from certain tools provided by the
938<c>alsa-tools</c> and <c>alsa-firmware</c> packages. If you need
939<c>alsa-tools</c>, be sure to define the ALSA_TOOLS variable in
940<path>/etc/make.conf</path> with the tools you require. For instance:
941</p>
942
943<pre caption="Selecting ALSA Tools in /etc/make.conf">
944ALSA_TOOLS="as10k1 ac3dec"
945</pre>
946
947<p>
948If the ALSA_TOOLS variable is not set, all available tools will be built.
949Now, install the <c>alsa-tools</c> (and/or <c>alsa-firmware</c>) package(s):
950</p>
951
952<pre caption="Installing ALSA Tools">
953# <i>emerge alsa-tools</i>
954</pre>
955
956</body>
411<section> 957</section>
412<title>Running and unmuting</title>
413<body>
414
415<p>
416Since we're Linux users, we don't want to reboot. So we'll start the alsasound
417script manually.
418</p>
419
420<pre caption="Starting ALSA">
421# <i>/etc/init.d/alsasound start</i>
422</pre>
423
424<p>
425ALSA is running now. If everything is ok, you should be able to see the ALSA
426modules loaded when running <c>lsmod</c>. However, sound won't work yet,
427because the channels are still muted. We need <c>amixer</c> to fix this.
428</p>
429
430<pre caption = "Running amixer">
431# <i>amixer</i>
432</pre>
433
434<warn>
435You shouldn't get this, but <e>if</e> you get an error about "amixer: Mixer
436attach default error: No such file or directory", you should manually modprobe
437<c>snd-mixer-oss</c> and <c>snd-pcm-oss</c> once. After that run amixer again.
438</warn>
439
440<pre caption="Only if you get an error when running amixer">
441# <i>modprobe snd-mixer-oss</i>
442# <i>modprobe snd-pcm-oss</i>
443# <i>amixer</i>
444</pre>
445
446<p>
447If you got this far, now unmute Master and PCM channels. Some hardware
448even requires you to unmute the center channel or even the surround
449channel.
450</p>
451
452<pre caption = "Unmuting channels">
453# <i>amixer set Master 100 unmute</i>
454# <i>amixer set PCM 100 unmute</i>
455<comment>Only if the above doesn't succeed on its own:</comment>
456# <i>amixer set Center 100 unmute</i>
457# <i>amixer set Surround 100 unmute</i>
458<comment>Test the sound:</comment>
459# <i>aplay $KDEDIR/share/sounds/pop.wav</i> <codenote>(pop.wav is part of KDE)</codenote>
460</pre>
461
462<p>
463We check to see if sound is working by using the aplay (alsa play) command. If
464you hear a pop, then sound is indeed working. Then, adjust the volume settings
465to your liking; the ncurses-based <c>alsamixer</c> is a great way to get them
466"just so".
467</p>
468
469<p>
470You may want to emerge <c>alsa-xmms</c> as that will provide ALSA support for
471XMMS.
472</p>
473
474<p>
475When you reboot your system, the <c>alsasound</c> init script will
476properly save and restore your volume settings.
477</p>
478
479</body>
480</section> 958<section>
481</chapter> 959<title>A Big thank you to...</title>
960<body>
482 961
483<chapter> 962<p>
484<title>Final Notes</title> 963Everyone who contributed to the earlier version of the Gentoo ALSA Guide:
964Vincent Verleye, Grant Goodyear, Arcady Genkin, Jeremy Huddleston,
965John P. Davis, Sven Vermeulen, Benny Chuang, Tiemo Kieft and Erwin.
966</p>
967
968</body>
485<section> 969</section>
486<title>After kernel-upgrades...</title>
487<body>
488
489<p>
490When you ever rebuild your kernel, or upgrade to another kernel, you'll have to
491rebuild the ALSA modules.
492</p>
493
494<p>
495Although you might have installed <c>alsa-driver</c>, <c>alsa-lib</c> and
496<c>alsa-utils</c>, only the first will have to be installed again, since it will
497put the alsa modules in <path>/lib/modules/*/kernel/sound/pci/</path>.
498</p>
499
500<pre caption="Needed after each kernel compile">
501# <i>emerge alsa-driver</i>
502</pre>
503
504</body>
505</section> 970<section>
506<section> 971<title>References</title>
507<title>/etc/modules.autoload</title>
508<body>
509
510<p>
511You won't have to edit this file for use with ALSA. After our <c>rc-update add
512alsasound boot</c>, our system will load the correct modules at startup.
513</p>
514
515<p>
516It's not necessary to add <c>snd-pcm-oss</c> or <c>snd-mixer-oss</c> in this
517file. Check the <uri link="http://www.djcj.org/LAU/guide/alsbook/faq1.html">this
518FAQ</uri> for more info.
519</p>
520
521</body> 972<body>
522</section>
523<section>
524<title>Known bugs</title>
525<body>
526
527<note>
528This guide lags behind on the alsa-development. Chances are these bugs
529are already fixed when you read this.
530</note>
531 973
532<ul> 974<ul>
533 <li>
534 If you have <b>lots of noise</b> when using <b>oss</b> emulation, add
535 <e>options snd-pcm-oss dsp_map=1</e> to <path>/etc/modules.d/alsa</path>
536 </li>
537</ul>
538
539</body>
540</section>
541<section>
542<title>Activating Joystick Support</title>
543<body>
544
545<p>
546If your soundcard has a joystick plug, you might be interested in activating
547joystick support for your soundcard. If so, start by verifying if your soundcard
548driver has a joystick parameter. You can verify this by running <c>modinfo</c>
549against your <path>snd-&lt;your chipset&gt;</path>. For instance, for the
550<c>snd-via82xx</c>:
551</p>
552
553<pre caption="Running modinfo">
554# <i>modinfo snd-via82xx</i>
555filename: /lib/modules/2.4.22-ck2/snd-via82xx.o
556description: "VIA VT82xx audio"
557author: "Jaroslav Kysela &lt;perex@suse.cz&gt;"
558license: "GPL"
559parm: index int array (min = 1, max = 8), description "Index value for VIA 82xx bridge."
560parm: id string array (min = 1, max = 8), description "ID string for VIA 82xx bridge."
561parm: enable int array (min = 1, max = 8), description "Enable audio part of VIA 82xx bridge."
562parm: mpu_port long array (min = 1, max = 8), description "MPU-401 port. (VT82C686x only)"
563<i>parm: joystick int array (min = 1, max = 8), description "Enable joystick. (VT82C686x only)"</i>
564parm: ac97_clock int array (min = 1, max = 8), description "AC'97 codec clock (default 48000Hz)."
565parm: dxs_support int array (min = 1, max = 8), description "Support for DXS channels
566 (0 = auto, 1 = enable, 2 = disable, 3 = 48k only, 4 = no VRA)"
567</pre>
568
569<p>
570If it has the <c>joystick</c> parameter, then append <c>joystick=1</c> to your
571<c>options</c> line in <path>/etc/modules.d/alsa</path>. For instance, for the
572<c>snd-via82xx</c>:
573</p>
574
575<pre caption="Adding the joystick parameter">
576alias snd-card-0 snd-via82xx
577options snd-via82xx joystick=1
578</pre>
579
580</body>
581</section>
582<section>
583<title>More links...</title>
584<body>
585
586<p>
587You could check these for additional info:
588</p>
589
590<ul>
591 <li>
592 <uri link="http://www.gentoo.org/doc/en/desktop.xml">The Gentoo Linux
593 Desktop Configuration Guide</uri>
594 </li>
595 <li>
596 <uri link="http://www.alsa-project.org">ALSA Project Homepage</uri> 975 <li><uri link="http://www.alsa-project.org/">The ALSA Project</uri></li>
597 </li>
598 <li>
599 <uri link="http://www.alsa-project.org/documentation.php3">ALSA Users
600 Documentation</uri>
601 </li>
602 <li>
603 <uri link="http://www.djcj.org">ALSA Howto's and FAQ's</uri>
604 </li>
605 <li>
606 <uri link="http://tldp.org/HOWTO/Sound-HOWTO/index.html">Linux Sound
607 HOWTO</uri>
608 </li>
609 <li>
610 <uri link="http://linux-sound.org/">Sound and MIDI Software For Linux</uri> 976 <li><uri link="http://linux-sound.org">Linux Sound/MIDI Software</uri></li>
611 </li>
612</ul> 977</ul>
613 978
614</body> 979</body>
615</section> 980</section>
616</chapter> 981</chapter>

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