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1<?xml version='1.0'?> 1<?xml version='1.0' encoding="UTF-8"?>
2<?xml-stylesheet href="/xsl/guide.xsl" type="text/xsl"?> 2<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/alsa-guide.xml,v 1.21 2003/11/23 16:30:50 swift Exp $ -->
3
4<!DOCTYPE guide SYSTEM "/dtd/guide.dtd"> 3<!DOCTYPE guide SYSTEM "/dtd/guide.dtd">
5 4
6<guide link = "/doc/en/alsa-guide.xml"> 5<guide link = "/doc/en/alsa-guide.xml">
7<title>Gentoo Linux ALSA Guide</title> 6<title>Gentoo Linux ALSA Guide</title>
8<author title="Author"><mail link="zu@pandora.be"> 7<author title="Author">
9 Vincent Verleye</mail> 8 <mail link="zu@pandora.be">Vincent Verleye</mail>
10</author> 9</author>
11 10<author title="Author">
12<author title="Editor"><mail link="zhen@gentoo.org"> 11 <mail link="g2boojum@gentoo.org">Grant Goodyear</mail>
13 John P. Davis</mail>
14</author> 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
29<license/>
15 30
16<abstract> 31<abstract>
17This guide will show you how to set up the Advanced Linux Sound Architecture (ALSA) on Gentoo Linux. 32This guide will show you how to set up the Advanced Linux Sound Architecture
18In addition to the Gentoo Linux Desktop Configuration Guide, this guide is supposed to give you more information on this subject. </abstract> 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>
19 36
20<version>1.0</version> 37<version>1.3.4</version>
21<date>30 Oct 2002</date> 38<date>November 23, 2003</date>
22 39
23<chapter> 40<chapter>
24<title>Introduction</title> 41<title>Introduction</title>
25<section> 42<section>
26 <title>What is ALSA?</title> 43<title>What is ALSA?</title>
27<body> 44<body>
45
28<p> 46<p>
29The Advanced Linux Sound Architecture (ALSA) is a project to improve the Linux sound subsystem by rewriting 47The Advanced Linux Sound Architecture (ALSA) is a project to improve the Linux
30large chunks of it. 48sound subsystem by rewriting large chunks of it. It is anticipated that ALSA
31It is anticipated that ALSA will make it into Linux kernel 2.6.x (or 3.x.x -- whichever comes first) as it becomes ready. 49will make it into Linux kernel 2.6.x (or 3.x.x -- whichever comes first) as it
50becomes ready.
32</p> 51</p>
33 52
34<p> 53<p>
35ALSA provides audio and MIDI functionality for Linux. 54ALSA provides audio and MIDI functionality for Linux.
36</p> 55</p>
37 56
38<p> 57<p>
39Quoted from <uri>http://www.alsa-project.org</uri>, ALSA has the following features: 58Quoted from <uri>http://www.alsa-project.org</uri>, ALSA has the following
40<ul><li> Efficient support for all types of audio interfaces, from consumer soundcards to professional multichannel audio interfaces.</li> 59features:
60</p>
61
62<ul>
63 <li>
64 Efficient support for all types of audio interfaces, from consumer
65 soundcards to professional multichannel audio interfaces
66 </li>
41 <li> Fully modularized sound drivers.</li> 67 <li>Fully modularized sound drivers</li>
42 <li> SMP and thread-safe design.</li> 68 <li>SMP and thread-safe design</li>
69 <li>
43 <li> User space library (alsa-lib) to simplify application programming and provide higher level functionality.</li> 70 User space library (alsa-lib) to simplify application programming and
71 provide higher level functionality
72 </li>
73 <li>
44 <li> Support for the older OSS API, providing binary compatibility for most OSS programs.</li> 74 Support for the older OSS API, providing binary compatibility for most OSS
75 programs
76 </li>
45</ul> 77</ul>
46There's lots more to ALSA however, like support for Full Duplex playback and recording, multiple soundcard support, 78
47hardware mixing of streams, extensive mixer capabilities (to support advanced features of new soundcards), ...
48</p> 79<p>
80There's lots more to ALSA however, like support for Full Duplex playback and
81recording, multiple soundcard support, hardware mixing of streams, extensive
82mixer capabilities (to support advanced features of new soundcards), ...
83</p>
84
49</body> 85</body>
50</section>
51<section> 86</section>
87<section>
52 <title>Why use ALSA?</title> 88<title>Why use ALSA?</title>
53<body> 89<body>
90
54<p> 91<p>
55If your soundcard is supported by the Linux kernel sound system or the commercial OSS/4Front sound driver system, 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
56which can be found in all 2.4.x Linux kernels, you could just aswell build <e>those modules</e> for use with your soundcard. 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
57If you want this, just read through the <uri link="http://www.tldp.org/HOWTO/Sound-HOWTO/index.html">Linux Sound HOWTO</uri>. 96link="http://www.tldp.org/HOWTO/Sound-HOWTO/index.html">Linux Sound HOWTO</uri>.
58</p> 97</p>
98
59<p> 99<p>
60However, those OSS/4Front drivers have some limitations -- being commercial is one. 100However, those OSS/4Front drivers have some limitations -- being commercial is
61ALSA is an attempt to go beyond these limitations and to do so in an open source fashion. 101one. ALSA is an attempt to go beyond these limitations and to do so in an open
62ALSA is a fully GPL and LGPL'ed sound driver system, that provides a professional quality system for recording, playback, 102source fashion. ALSA is a fully GPL and LGPL'ed sound driver system, that
63and MIDI sequencing. 103provides a professional quality system for recording, playback, and MIDI
104sequencing.
64</p> 105</p>
106
65</body> 107</body>
66</section>
67<section> 108</section>
109<section>
68 <title>What cards does ALSA support?</title> 110<title>What cards does ALSA support?</title>
69<body> 111<body>
112
70<p> 113<p>
71ALSA tries to support as many (new) cards as possible by providing open-source drivers. 114ALSA tries to support as many (new) cards as possible by providing open-source
72However, some vendors may provide binary-only packages. 115drivers. However, some vendors may provide binary-only packages.
116</p>
117
73</p> 118<p>
74<p>To know if your card is supported, you can find a Soundcard Matrix of supported and not-supported cards here: 119To know if your card is supported, you can find a Soundcard Matrix of supported
75<uri>http://www.alsa-project.org/alsa-doc/</uri>. 120and not-supported cards here: <uri>http://www.alsa-project.org/alsa-doc/</uri>.
76</p> 121</p>
122
77</body> 123</body>
78</section> 124</section>
79</chapter> 125</chapter>
80 126
81<chapter> 127<chapter>
82<title>Installation</title> 128<title>Installation</title>
83<section> 129<section>
130<title>Gentoo USE flags</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>
141</section>
142<section>
84 <title>Kernel modules</title> 143<title>Kernel modules</title>
85<body> 144<body>
86<p> 145
87Since we're still using 2.4.x kernel sources, we'll have to compile kernel modules and ALSA modules separately.
88</p> 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>
152
89<p> 153<p>
90First we'll make sure that our kernel configuration is ready for use with ALSA. 154First we'll make sure that our kernel configuration is ready for use with ALSA.
91All you need in your kernel configuration is having Sound Card Support set to be built as a module (M). 155All you need in your kernel configuration is having Sound Card Support set to
92This will build <c>soundcore.o</c>. 156be built as a module (M). This will build <path>soundcore.o</path>.
93</p>
94<p> 157</p>
95<note> 158
96Possibly, this will also work when you built Sound Card Support in the kernel (Y) instead of building it as a module (M).
97However, the official ALSA documentation suggests building it as a module, since ALSA will try loading it.
98</note> 159<note>
160Possibly, this will also work when you built Sound Card Support in the kernel
161(Y) instead of building it as a module (M). However, the official ALSA
162documentation suggests building it as a module, since ALSA will try loading it.
163</note>
164
99</p> 165<p>
100<p>If you already have a working kernel configuration, make sure you remove all sound drivers (except for Sound Card Support). 166If you already have a working kernel configuration, make sure you remove all
101If you wish to do this without having to reboot, you could do like this: 167sound drivers (except for Sound Card Support). If you wish to do this without
168having to reboot, you could do like this:
102</p> 169</p>
103<pre> 170
171<pre caption="Kernel configuration">
104# <c>cd /usr/src/linux</c> 172# <i>cd /usr/src/linux</i>
105# <c>cp .config ~</c> 173# <i>cp .config ~/</i>
106# <c>make mrproper</c> 174# <i>make mrproper</i>
107# <c>cp ~/.config .</c> 175# <i>cp ~/.config .</i>
108# <c>make menuconfig</c> 176# <i>make menuconfig</i>
109</pre> 177</pre>
178
110<p> 179<p>
111Now select <e>Sound Card Support</e> as Module (M) and deselect all other sound drivers. 180Now select <e>Sound Card Support</e> as Module (M) and deselect all other sound
112Exit and say Y to save your kernel configuration. 181drivers. Exit and say Y to save your kernel configuration. After that, build
113After that, build the modules: 182the modules:
114</p> 183</p>
115<pre> 184
185<pre caption="Kernel compilation">
116# <c>make dep clean</c> 186# <i>make dep clean</i>
117# <c>make modules modules_install</c> 187# <i>make modules modules_install</i>
118</pre> 188</pre>
189
119<p> 190<p>
120Before installing your new modules, this last line will delete all your previous modules, 191Before installing your new modules, this last line will delete all your previous
121even the ones from a previous ALSA installation. 192modules, even the ones from a previous ALSA installation.
122</p>
123<p> 193</p>
194
124<impo> 195<impo>
125This means, whenever you recompile your kernel later on, you MUST recompile <c>alsa-driver</c>. 196This means, whenever you recompile your kernel later on, you MUST recompile
197<c>alsa-driver</c>.
126</impo> 198</impo>
127</p>
128<p>
129<note>However, there's no need to reinstall <c>nvidia-kernel</c>, the Nvidia drivers are in a separate directory
130in <path>/lib/modules/*/video</path> and won't get deleted by a <c>make modules modules_install</c>
131</note>
132</p>
133</body>
134</section>
135 199
200</body>
136<section> 201</section>
202<section>
137 <title>ALSA modules</title> 203<title>ALSA modules</title>
138<body> 204<body>
139 205
140<p>
141Now it's time to install the ALSA drivers for your soundcard(s). If your soundcard is PCI, you can find out the name
142and type of your soundcard by looking at the output of /proc/pci
143<pre>#<c>cat /proc/pci | grep audio</c></pre>
144</p> 206<p>
145 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>.
146<p> 210</p>
211
212<pre caption="Search for soundcard information">
213# <i>grep audio /proc/pci</i>
214</pre>
215
147<warn> 216<warn>
148If you had a previous sound setup and there are still non-ALSA sound modules loaded, unload them <e>now</e>. 217If you had a previous sound setup and there are still non-ALSA sound modules
149Check with <c>lsmod</c> and use <c>rmmod</c> to unload all sound-related modules on your system. 218loaded, unload them <e>now</e>. Check with <c>lsmod</c> and use <c>rmmod</c>
219to unload all sound-related modules on your system.
150</warn> 220</warn>
221
151</p> 222<p>
152 223We could simply do an <c>emerge alsa-driver</c> now, this would compile and
224install <e>all</e> ALSA sound drivers.
153<p> 225</p>
154We could simply do an <c>emerge alsa-driver</c> now, this would compile and install <e>all</e> ALSA sound drivers. 226
155</p> 227<p>
156<p>
157However, to save some time, lookup the <e>Module Name</e> of your soundcard(s) on the 228However, to save some time, lookup the <e>Module Name</e> of your soundcard(s)
158<uri link="http://www.alsa-project.org/alsa-doc">ALSA Soundcard Matrix</uri> under the <e>Install</e> section. 229on the <uri link="http://www.alsa-project.org/alsa-doc">ALSA Soundcard
159Mine is <c>EMU10K1</c>, since I have an SBlive! soundcard. 230Matrix</uri> by following the <e>Details</e> link in the <e>Driver and Docs</e>
160We'll set ALSA_CARDS environment to this value before emerging, so emerge will only compile the drivers we need. 231column in the row of the chipset of your soundcard. Mine is <c>snd-emu10k1</c>,
161</p> 232since I have an SBlive! soundcard, with the <e>EMU10K1</e> chipset. We'll set
162 233ALSA_CARDS environment to the value of the module name before emerging (but
234without the snd prefix), so emerge will only compile the drivers we need.
163<p> 235</p>
164<pre> 236
237<pre caption="Compile correct modules">
165# <c>env ALSA_CARDS='emu10k1' emerge alsa-driver</c> 238# <i>env ALSA_CARDS='emu10k1' emerge alsa-driver</i>
166</pre>
167</p> 239</pre>
168<p> 240
169<note>
170When you want to install ALSA drivers for more than one soundcard, you could set ALSA_CARDS to a space-separated list
171of drivers; like this: <c>env ALSA_CARDS='emu10k1 intel8x0 ens1370' emerge alsa-driver</c>
172</note> 241<note>
242You can also add this value in <path>/etc/make.conf</path>, so when you have
243to emerge the alsa-driver later on you can just run <c>emerge alsa-driver</c>.
244For example, like this: <c>echo 'ALSA_CARDS="emu10k1"' >> /etc/make.conf</c>
245</note>
173 246
247<note>
248When you want to install ALSA drivers for more than one soundcard, you could
249set ALSA_CARDS to a space-separated list of drivers; like this: <c>env
250ALSA_CARDS='emu10k1 intel8x0 ens1370' emerge alsa-driver</c>
251</note>
252
253<note>
174<note>If you want to have OSS compatibility, make sure to emerge <i>alsa-oss</i>, it is the ALSA/OSS compatibility 254If you want to have OSS compatibility, make sure to emerge <i>alsa-oss</i>, it
175wrapper. </note> 255is the ALSA/OSS compatibility wrapper.
256</note>
176 257
177</p> 258<note>
259If you plan on recompiling your kernels numerous times, it might
260be adviseable to emerge <c>alsa-driver</c> with <c>--buildpkg</c>. This
261will create a binary package for it. Later, after recompiling your kernel,
262you can just do <c>emerge --usepkg alsa-driver</c> which will install the
263binary package instead of recompiling it completely.
264</note>
265
178<p> 266<p>
179After this, the ALSA modules should be installed on your system. 267After this, the ALSA modules should be installed on your system.
180</p> 268</p>
269
181</body> 270</body>
182</section>
183<section> 271</section>
272<section>
184 <title>Configuration of ALSA</title> 273<title>Configuration of ALSA</title>
185<body> 274<body>
275
186<p> 276<p>
187Let's start configuring now to get ALSA working properly. 277Let's start configuring now to get ALSA working properly. We'll need to edit
188We'll need to edit some files, to let our system know about the freshly installed ALSA modules. 278some files, to let our system know about the freshly installed ALSA modules.
189</p>
190<p> 279</p>
191First file to edit is <path>/etc/modules.d/alsa</path>. 280
192</p> 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
193<warn> 293<warn>
194There is no need to edit <path>/etc/modules.conf</path>. Instead, always edit files in <path>/etc/modules.d</path>. 294There is no need to edit <path>/etc/modules.conf</path>. Instead, always edit
295files in <path>/etc/modules.d</path>.
195</warn> 296</warn>
297
196<p> 298<p>
197Check the ALSA portion <e>at the top of the file</e>. 299Check the ALSA portion <e>at the bottom of the file</e>. By tweaking this line
198By adding this line you can specify the max number of soundcards you have (generally, just one). 300you can specify the max number of soundcards you have (generally, just one).
199</p>
200<p> 301</p>
302
201<pre caption="At the top of /etc/modules.d/alsa"> 303<pre caption="At the bottom of /etc/modules.d/alsa">
202# Alsa 0.9.X kernel modules' configuration file. 304<comment>Set this to the correct number of cards.</comment>
203# $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/alsa-guide.xml,v 1.2 2002/11/15 18:39:34 zhen Exp $ 305options snd cards_limit=1
204
205# ALSA portion
206alias char-major-116 snd
207<c>options snd snd_major=116 snd_cards_limit=1</c>
208# OSS/Free portion
209alias char-major-14 soundcore
210
211##
212## IMPORTANT:
213</pre> 306</pre>
307
214</p> 308<p>
215<p>
216Now we'll specify the sounddriver(s) ALSA should use. In the same file, edit like this: 309Now we'll specify the sounddriver(s) ALSA should use. In the same file, edit
310like this:
311</p>
312
217<pre caption="A bit lower in /etc/modules.d/alsa"> 313<pre caption="In /etc/modules.d/alsa">
218## and then run `update-modules' command. 314## and then run `modules-update' command.
219## Read alsa-driver's INSTALL file in /usr/share/doc for more info. 315## Read alsa-driver's INSTALL file in /usr/share/doc for more info.
220## 316##
221## ALSA portion 317## ALSA portion
222<c>alias snd-card-0 snd-emu10k1</c> 318alias snd-card-0 snd-emu10k1
223<c>## If you have more than one, add: 319<comment>## If you have more than one, add:</comment>
224## alias snd-card-1 snd-intel8x0 320## alias snd-card-1 snd-intel8x0
225## alias snd-card-2 snd-ens1370</c> 321## alias snd-card-2 snd-ens1370
226## OSS/Free portion 322## OSS/Free portion
227## alias sound-slot-0 snd-card-0 323## alias sound-slot-0 snd-card-0
228## alias sound-slot-1 snd-card-1 324## alias sound-slot-1 snd-card-1
229## 325##
230</pre> 326</pre>
231</p> 327
232<p>
233<note> 328<note>
234If you have more than one soundcard, adjust the <c>snd_cards_limit</c> value and add more snd-card aliases to the file. 329If you have more than one soundcard, adjust the <c>cards_limit</c> value and add
235I don't have experience with this, but you can find examples for configurations with two or more soundcards in 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
236<uri link="http://www.alsa-project.org/alsa-doc/alsa-howto/c1660.htm">Chapter 6</uri> 332link="http://www.alsa-project.org/alsa-doc/alsa-howto/c1660.htm">Chapter 6</uri>
333of the <uri
237of the <uri link="http://www.alsa-project.org/alsa-doc/alsa-howto/alsa-howto.html">ALSA Howto</uri>. 334link="http://www.alsa-project.org/alsa-doc/alsa-howto/alsa-howto.html">ALSA
335Howto</uri>.
238</note> 336</note>
337
239</p> 338<p>
339Last thing to do in this file, almost at the end, check if these lines are there
340and uncommented:
240<p> 341</p>
241Last thing to do in this file, at the very bottom, check if these lines are there and uncommented: 342
242<pre caption="at the very bottom of /etc/modules.d/alsa"> 343<pre caption="Near the end of /etc/modules.d/alsa">
243alias /dev/mixer snd-mixer-oss 344alias /dev/mixer snd-mixer-oss
244alias /dev/dsp snd-pcm-oss 345alias /dev/dsp snd-pcm-oss
245alias /dev/midi snd-seq-oss 346alias /dev/midi snd-seq-oss
246</pre> 347</pre>
348
247</p> 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>.
248<p> 352</p>
249Now double-check the file <path>/etc/modules.d/alsa</path> and when you're sure everyting is ok, run <c>update-modules</c>. 353
354<pre caption="Running modules-update">
355# <i>modules-update</i>
250<pre> 356</pre>
251# <c>update-modules</c> 357
252</pre>
253</p>
254<note>
255Running <c>update-modules</c> here will insert the data from <path>/etc/modules.d/alsa</path> into <path>/etc/modules.conf</path>
256</note> 358<note>
257<p> 359Running <c>modules-update</c> here will insert the data from
258You should also verify that /etc/devfsd.conf has the alsa devices and permissions correctly registered. 360<path>/etc/modules.d/alsa</path> into <path>/etc/modules.conf</path>
361</note>
362
259</p> 363<p>
260<pre> 364You should also verify that <path>/etc/devfsd.conf</path> has the alsa devices
261# nano -w /etc/devfsd.conf 365and permissions correctly registered.
262</pre> 366</p>
263<pre> 367
368<pre caption="/etc/devfsd.conf">
264# ALSA/OSS stuff 369# ALSA/OSS stuff
265# Comment/change these if you want to change the permissions on 370# Comment/change these if you want to change the permissions on
266# the audio devices 371# the audio devices
267LOOKUP snd MODLOAD ACTION snd 372LOOKUP snd MODLOAD ACTION snd
268LOOKUP dsp MODLOAD 373LOOKUP dsp MODLOAD
269LOOKUP mixer MODLOAD 374LOOKUP mixer MODLOAD
270LOOKUP midi MODLOAD 375LOOKUP midi MODLOAD
271REGISTER sound/.* PERMISSIONS root.audio 660 376REGISTER sound/.* PERMISSIONS root.audio 660
272REGISTER snd/.* PERMISSIONS root.audio 660 377REGISTER snd/.* PERMISSIONS root.audio 660
273</pre> 378</pre>
274<note> 379
275Notice that devfsd.conf sets /dev/sound permissions to be root.audio. Thus, for non-root users to use audio they will have to be part of the audio group.
276</note> 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
277</body> 386</body>
278</section> 387</section>
279</chapter> 388</chapter>
389
280<chapter> 390<chapter>
281<title>Starting ALSA</title> 391<title>Starting ALSA</title>
282<section> 392<section>
283 <title>Adding alsasound to a runlevel</title> 393<title>Adding alsasound to a runlevel</title>
284<body> 394<body>
395
285<p> 396<p>
286First thing to do now, is to make ALSA startup at boottime. Like this: 397First thing to do now, is to make ALSA startup at boottime. Like this:
287<pre> 398</p>
399
400<pre caption="Add ALSA to the default runlevel">
288# <c>rc-update add alsasound boot</c> 401# <i>rc-update add alsasound boot</i>
289</pre>
290</p>
291<p>
292<warn>Note that the alsasound script should be added to the "boot" runlevel, not the "default" runlevel.</warn>
293</p>
294</body>
295</section>
296<section>
297 <title>Running and unmuting</title>
298<body>
299<p>
300Since we're Linux users, we don't want to reboot. So we'll start the alsasound script manually.
301</p>
302<pre> 402</pre>
303# <c>/etc/init.d/alsasound start</c> 403
304</pre>
305<p>
306ALSA is running now. If everything is ok, you should be able to see the ALSA modules loaded when running <c>lsmod</c>.
307However, sound won't work yet, because the channels are still muted. We need <c>alsa-utils</c> for this.
308</p>
309<pre>
310# <c>emerge alsa-utils</c>
311# <c>amixer</c>
312</pre>
313<p>
314<warn> 404<warn>
315You shouldn't get this, but <e>if</e> you get an error about "amixer: Mixer attach default error: No such file or directory", you should manually insmod 405Note that the alsasound script should be added to the "boot" runlevel, not the
406"default" runlevel.
407</warn>
408
409</body>
410</section>
411<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> for 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
316<c>snd-mixer-oss</c> and <c>snd-pcm-oss</c> once. After that run amixer again. 437<c>snd-mixer-oss</c> and <c>snd-pcm-oss</c> once. After that run amixer again.
317</warn> 438</warn>
318</p> 439
319<pre caption="only if you get an error when running amixer"> 440<pre caption="Only if you get an error when running amixer">
320# <c>insmod snd-mixer-oss</c> 441# <i>modprobe snd-mixer-oss</i>
321# <c>insmod snd-pcm-oss</c> 442# <i>modprobe snd-pcm-oss</i>
322# <c>amixer</c> 443# <i>amixer</i>
323</pre>
324<p>
325If you got this far, now unmute both Master and PCM channels.
326</p>
327<p>
328<pre> 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">
329# <c>amixer set Master 100 unmute</c> 453# <i>amixer set Master 100 unmute</i>
330# <c>amixer set PCM 100 unmute</c> 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>
331# <c>aplay /usr/kde/3/share/sounds/pop.wav</c> <codenote>(pop.wav is part of KDE)</codenote> 459# <i>aplay $KDEDIR/share/sounds/pop.wav</i> <codenote>(pop.wav is part of KDE)</codenote>
332</pre> 460</pre>
461
333</p> 462<p>
334We check to see if sound is working by using the aplay (alsa play) command. If you hear a pop, then sound is indeed working. 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
335Then, adjust the volume settings to your liking; the ncurses-based <c>alsamixer</c> is a great way to get them "just so". 465to your liking; the ncurses-based <c>alsamixer</c> is a great way to get them
466"just so".
336<p> 467</p>
468
469<p>
337You may want to emerge <c>alsa-xmms</c> as that will provide ALSA support for XMMS. 470You may want to emerge <c>alsa-xmms</c> as that will provide ALSA support for
471XMMS.
472</p>
473
338</p> 474<p>
339When you reboot your system, the <e>alsasound</e> init script will properly save and restore your volume settings. 475When you reboot your system, the <c>alsasound</c> init script will properly saveand restore your volume settings.
476</p>
477
340</body> 478</body>
341</section> 479</section>
342</chapter> 480</chapter>
481
343<chapter> 482<chapter>
344<title>Final Notes</title> 483<title>Final Notes</title>
345<section> 484<section>
346 <title>After kernel-upgrades..</title> 485<title>After kernel-upgrades..</title>
347<body> 486<body>
487
488<p>
348<p>When you ever rebuild your kernel, or upgrade to another kernel, you'll have to rebuild the ALSA modules.</p> 489When you ever rebuild your kernel, or upgrade to another kernel, you'll have to
490rebuild the ALSA modules.
491</p>
492
493<p>
349<p>Although you might have installed <c>alsa-driver</c>, <c>alsa-libs</c> and <c>alsa-utils</c>, only the first will 494Although you might have installed <c>alsa-driver</c>, <c>alsa-libs</c> and
350have to be installed again, since it will put the alsa modules in 495<c>alsa-utils</c>, only the first will have to be installed again, since it will
351<path>/lib/modules/*/kernel/sound/pci/</path>.</p> 496put the alsa modules in <path>/lib/modules/*/kernel/sound/pci/</path>.
497</p>
498
352<pre caption="needed after each kernel compile"> 499<pre caption="needed after each kernel compile">
353emerge alsa-driver 500# <i>emerge alsa-driver</i>
354</pre> 501</pre>
502
355</body> 503</body>
356</section>
357<section> 504</section>
505<section>
358 <title>/etc/modules.autoload</title> 506<title>/etc/modules.autoload</title>
359<body> 507<body>
508
509<p>
360<p>You won't have to edit this file for use with ALSA. After our <c>rc-update add alsasound boot</c>, our system will 510You won't have to edit this file for use with ALSA. After our <c>rc-update add
361load the correct modules at startup.</p> 511alsasound boot</c>, our system will load the correct modules at startup.
512</p>
513
514<p>
362<p>It's not necessary to add <c>snd-pcm-oss</c> or <c>snd-mixer-oss</c> in this file. 515It's not necessary to add <c>snd-pcm-oss</c> or <c>snd-mixer-oss</c> in this
363Check the <uri link="http://www.djcj.org/LAU/guide/alsbook/faq1.html">this FAQ</uri> for more info.</p> 516file. Check the <uri link="http://www.djcj.org/LAU/guide/alsbook/faq1.html">this
517FAQ</uri> for more info.
518</p>
519
364</body> 520</body>
365</section>
366<section> 521</section>
522<section>
523<title>Known bugs</title>
524<body>
525
526<note>
527This guide lags behind on the alsa-development. Chances are these bugs
528are already fixed when you read this.
529</note>
530
531<ul>
532 <li>
533 If you have <b>lots of noise</b> when using <b>oss</b> emulation, add
534 <e>options snd-pcm-oss dsp_map=1</e> to <path>/etc/modules.d/alsa</path>
535 </li>
536</ul>
537
538</body>
539</section>
540<section>
541<title>Activating Joystick Support</title>
542<body>
543
544<p>
545If your soundcard has a joystick plug, you might be interested in activating
546joystick support for your soundcard. If so, start by verifying if your soundcard
547driver has a joystick parameter. You can verify this by running <c>modinfo</c>
548against your <path>snd-&lt;your chipset&gt;</path>. For instance, for the
549<c>snd-via82xx</c>:
550</p>
551
552<pre caption="Running modinfo">
553# <i>modinfo snd-via82xx</i>
554filename: /lib/modules/2.4.22-ck2/snd-via82xx.o
555description: "VIA VT82xx audio"
556author: "Jaroslav Kysela &lt;perex@suse.cz&gt;"
557license: "GPL"
558parm: index int array (min = 1, max = 8), description "Index value for VIA 82xx bridge."
559parm: id string array (min = 1, max = 8), description "ID string for VIA 82xx bridge."
560parm: enable int array (min = 1, max = 8), description "Enable audio part of VIA 82xx bridge."
561parm: mpu_port long array (min = 1, max = 8), description "MPU-401 port. (VT82C686x only)"
562<i>parm: joystick int array (min = 1, max = 8), description "Enable joystick. (VT82C686x only)"</i>
563parm: ac97_clock int array (min = 1, max = 8), description "AC'97 codec clock (default 48000Hz)."
564parm: dxs_support int array (min = 1, max = 8), description "Support for DXS channels
565 (0 = auto, 1 = enable, 2 = disable, 3 = 48k only, 4 = no VRA)"
566</pre>
567
568<p>
569If it has the <c>joystick</c> parameter, then append <c>joystick=1</c> to your
570<c>options</c> line in <path>/etc/modules.d/alsa</path>. For instance, for the
571<c>snd-via82xx</c>:
572</p>
573
574<pre caption="Adding the joystick parameter">
575alias snd-card-0 snd-via82xx
576options snd-via82xx joystick=1
577</pre>
578
579</body>
580</section>
581<section>
367 <title>More links..</title> 582<title>More links..</title>
368<body> 583<body>
584
369<p> 585<p>
370You could check these for additional info: 586You could check these for additional info:
371</p> 587</p>
372<p> 588
373<ul> 589<ul>
374<li><uri link="http://www.gentoo.org/doc/desktop.html">The Gentoo Linux Desktop Configuration Guide</uri></li> 590 <li>
591 <uri link="http://www.gentoo.org/doc/en/desktop.xml">The Gentoo Linux
592 Desktop Configuration Guide</uri>
593 </li>
594 <li>
375<li><uri link="http://www.alsa-project.org">ALSA Project Homepage</uri></li> 595 <uri link="http://www.alsa-project.org">ALSA Project Homepage</uri>
596 </li>
597 <li>
376<li><uri link="http://www.alsa-project.org/documentation.php3">ALSA Users Documentation</uri></li> 598 <uri link="http://www.alsa-project.org/documentation.php3">ALSA Users
599 Documentation</uri>
600 </li>
601 <li>
377<li><uri link="http://www.djcj.org">ALSA Howto's and FAQ's</uri></li> 602 <uri link="http://www.djcj.org">ALSA Howto's and FAQ's</uri>
603 </li>
604 <li>
378<li><uri link="http://tldp.org/HOWTO/Sound-HOWTO/index.html">Linux Sound HOWTO</uri></li> 605 <uri link="http://tldp.org/HOWTO/Sound-HOWTO/index.html">Linux Sound
606 HOWTO</uri>
607 </li>
608 <li>
379<li><uri link="http://linux-sound.org/">Sound and MIDI Software For Linux</uri></li> 609 <uri link="http://linux-sound.org/">Sound and MIDI Software For Linux</uri>
610 </li>
380</ul> 611</ul>
381</p> 612
382</body> 613</body>
383</section> 614</section>
384</chapter> 615</chapter>
385</guide> 616</guide>

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