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1 zhen 1.3 <?xml version='1.0' encoding="UTF-8"?>
2 aaby 1.22 <!-- $Header: /home/cvsroot/gentoo/xml/htdocs/doc/en/alsa-guide.xml,v 1.21 2003/11/23 16:30:50 swift Exp $ -->
3 drobbins 1.1 <!DOCTYPE guide SYSTEM "/dtd/guide.dtd">
4    
5 zhen 1.2 <guide link = "/doc/en/alsa-guide.xml">
6 drobbins 1.1 <title>Gentoo Linux ALSA Guide</title>
7 swift 1.20 <author title="Author">
8     <mail link="zu@pandora.be">Vincent Verleye</mail>
9 drobbins 1.1 </author>
10 swift 1.20 <author title="Author">
11     <mail link="g2boojum@gentoo.org">Grant Goodyear</mail>
12 peesh 1.10 </author>
13 swift 1.20 <author title="Author">
14     <mail link="agenkin@gentoo.org">Arcady Genkin</mail>
15 peesh 1.10 </author>
16 swift 1.18 <author title="Editor"><!-- zhen@gentoo.org -->
17     John P. Davis
18 drobbins 1.1 </author>
19 swift 1.20 <author title="Editor">
20     <mail link="swift@gentoo.org">Sven Vermeulen</mail>
21 swift 1.12 </author>
22 swift 1.20 <author title="Editor">
23     <mail link="bennyc@gentoo.org">Benny Chuang</mail>
24 bennyc 1.14 </author>
25 swift 1.20 <author title="Editor">
26     <mail link="blubber@gentoo.org">Tiemo Kieft</mail>
27 blubber 1.16 </author>
28 drobbins 1.1
29 swift 1.11 <license/>
30    
31 drobbins 1.1 <abstract>
32 swift 1.20 This 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
34     Guide, this guide is supposed to give you more information on this subject.
35     </abstract>
36 drobbins 1.1
37 swift 1.21 <version>1.3.4</version>
38     <date>November 23, 2003</date>
39 drobbins 1.1
40     <chapter>
41     <title>Introduction</title>
42     <section>
43 swift 1.20 <title>What is ALSA?</title>
44 drobbins 1.1 <body>
45 swift 1.20
46 drobbins 1.1 <p>
47 swift 1.20 The Advanced Linux Sound Architecture (ALSA) is a project to improve the Linux
48     sound subsystem by rewriting large chunks of it. It is anticipated that ALSA
49     will make it into Linux kernel 2.6.x (or 3.x.x -- whichever comes first) as it
50     becomes ready.
51 drobbins 1.1 </p>
52    
53     <p>
54     ALSA provides audio and MIDI functionality for Linux.
55     </p>
56    
57     <p>
58 swift 1.20 Quoted from <uri>http://www.alsa-project.org</uri>, ALSA has the following
59     features:
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>
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>
77 drobbins 1.1 </ul>
78 swift 1.20
79     <p>
80     There's lots more to ALSA however, like support for Full Duplex playback and
81     recording, multiple soundcard support, hardware mixing of streams, extensive
82     mixer capabilities (to support advanced features of new soundcards), ...
83 drobbins 1.1 </p>
84 swift 1.20
85 drobbins 1.1 </body>
86     </section>
87     <section>
88 swift 1.20 <title>Why use ALSA?</title>
89 drobbins 1.1 <body>
90 swift 1.20
91 drobbins 1.1 <p>
92 swift 1.20 If your soundcard is supported by the Linux kernel sound system or the
93     commercial OSS/4Front sound driver system, which can be found in all 2.4.x
94     Linux kernels, you could just aswell build <e>those modules</e> for use with
95     your soundcard. If you want this, just read through the <uri
96     link="http://www.tldp.org/HOWTO/Sound-HOWTO/index.html">Linux Sound HOWTO</uri>.
97 drobbins 1.1 </p>
98 swift 1.20
99 drobbins 1.1 <p>
100 swift 1.20 However, those OSS/4Front drivers have some limitations -- being commercial is
101 aaby 1.22 one. ALSA is an attempt to go beyond these limitations and to do so in an open-source fashion. ALSA is a fully GPL and LGPL'ed sound driver system, that
102 swift 1.20 provides a professional quality system for recording, playback, and MIDI
103     sequencing.
104 drobbins 1.1 </p>
105 swift 1.20
106 drobbins 1.1 </body>
107     </section>
108     <section>
109 swift 1.20 <title>What cards does ALSA support?</title>
110 drobbins 1.1 <body>
111 swift 1.20
112 drobbins 1.1 <p>
113 swift 1.20 ALSA tries to support as many (new) cards as possible by providing open-source
114     drivers. However, some vendors may provide binary-only packages.
115 drobbins 1.1 </p>
116 swift 1.20
117     <p>
118     To know if your card is supported, you can find a Soundcard Matrix of supported
119     and not-supported cards here: <uri>http://www.alsa-project.org/alsa-doc/</uri>.
120 drobbins 1.1 </p>
121 swift 1.20
122 drobbins 1.1 </body>
123     </section>
124     </chapter>
125    
126     <chapter>
127     <title>Installation</title>
128     <section>
129 swift 1.17 <title>Gentoo USE flags</title>
130     <body>
131    
132     <p>
133     To compile programs with ALSA-support, be sure to add <e>alsa</e> to
134     your USE-variable. However, several tools don't support alsa yet, and
135     require OSS. ALSA provides OSS-emulation if you define <e>oss</e> in your
136     USE-variable before you start.
137     </p>
138    
139     </body>
140     </section>
141     <section>
142 swift 1.20 <title>Kernel modules</title>
143 drobbins 1.1 <body>
144 swift 1.20
145 drobbins 1.1 <p>
146 swift 1.20 Since we're still using 2.4.x kernel sources, we'll have to compile kernel
147     modules and ALSA modules separately. People who are using a 2.5.x kernel can
148     do this from within their kernel configuration, since the ALSA modules are
149     included in the kernel sources and should be built there.
150 drobbins 1.1 </p>
151 swift 1.20
152 drobbins 1.1 <p>
153     First we'll make sure that our kernel configuration is ready for use with ALSA.
154 swift 1.20 All you need in your kernel configuration is having Sound Card Support set to
155     be built as a module (M). This will build <path>soundcore.o</path>.
156 drobbins 1.1 </p>
157 swift 1.20
158 drobbins 1.1 <note>
159 swift 1.20 Possibly, this will also work when you built Sound Card Support in the kernel
160     (Y) instead of building it as a module (M). However, the official ALSA
161     documentation suggests building it as a module, since ALSA will try loading it.
162 drobbins 1.1 </note>
163 swift 1.20
164     <p>
165     If you already have a working kernel configuration, make sure you remove all
166     sound drivers (except for Sound Card Support). If you wish to do this without
167     having to reboot, you could do like this:
168 drobbins 1.1 </p>
169 swift 1.20
170     <pre caption="Kernel configuration">
171 blubber 1.16 # <i>cd /usr/src/linux</i>
172     # <i>cp .config ~/</i>
173     # <i>make mrproper</i>
174     # <i>cp ~/.config .</i>
175     # <i>make menuconfig</i>
176 drobbins 1.1 </pre>
177 swift 1.20
178 drobbins 1.1 <p>
179 swift 1.20 Now select <e>Sound Card Support</e> as Module (M) and deselect all other sound
180     drivers. Exit and say Y to save your kernel configuration. After that, build
181     the modules:
182 drobbins 1.1 </p>
183 swift 1.20
184     <pre caption="Kernel compilation">
185 blubber 1.16 # <i>make dep clean</i>
186     # <i>make modules modules_install</i>
187 drobbins 1.1 </pre>
188 swift 1.20
189 drobbins 1.1 <p>
190 swift 1.20 Before installing your new modules, this last line will delete all your previous
191     modules, even the ones from a previous ALSA installation.
192 drobbins 1.1 </p>
193 swift 1.20
194 drobbins 1.1 <impo>
195 swift 1.20 This means, whenever you recompile your kernel later on, you MUST recompile
196     <c>alsa-driver</c>.
197 drobbins 1.1 </impo>
198 swift 1.20
199 drobbins 1.1 </body>
200     </section>
201     <section>
202 swift 1.20 <title>ALSA modules</title>
203 drobbins 1.1 <body>
204    
205     <p>
206 swift 1.20 Now it's time to install the ALSA drivers for your soundcard(s). If your
207     soundcard is PCI, you can find out the name and type of your soundcard by
208     looking at the output of <path>/proc/pci</path>.
209 drobbins 1.1 </p>
210 swift 1.20
211     <pre caption="Search for soundcard information">
212 blubber 1.16 # <i>grep audio /proc/pci</i>
213     </pre>
214    
215 drobbins 1.1 <warn>
216 swift 1.20 If you had a previous sound setup and there are still non-ALSA sound modules
217     loaded, unload them <e>now</e>. Check with <c>lsmod</c> and use <c>rmmod</c>
218     to unload all sound-related modules on your system.
219 drobbins 1.1 </warn>
220    
221     <p>
222 swift 1.20 We could simply do an <c>emerge alsa-driver</c> now, this would compile and
223     install <e>all</e> ALSA sound drivers.
224 drobbins 1.1 </p>
225 swift 1.20
226 drobbins 1.1 <p>
227 swift 1.20 However, to save some time, lookup the <e>Module Name</e> of your soundcard(s)
228     on the <uri link="http://www.alsa-project.org/alsa-doc">ALSA Soundcard
229     Matrix</uri> by following the <e>Details</e> link in the <e>Driver and Docs</e>
230     column in the row of the chipset of your soundcard. Mine is <c>snd-emu10k1</c>,
231     since I have an SBlive! soundcard, with the <e>EMU10K1</e> chipset. We'll set
232     ALSA_CARDS environment to the value of the module name before emerging (but
233     without the snd prefix), so emerge will only compile the drivers we need.
234 drobbins 1.1 </p>
235    
236 swift 1.20 <pre caption="Compile correct modules">
237 blubber 1.16 # <i>env ALSA_CARDS='emu10k1' emerge alsa-driver</i>
238 drobbins 1.1 </pre>
239 swift 1.20
240 drobbins 1.1 <note>
241 swift 1.20 You can also add this value in <path>/etc/make.conf</path>, so when you have
242     to emerge the alsa-driver later on you can just run <c>emerge alsa-driver</c>.
243 seo 1.8 For example, like this: <c>echo 'ALSA_CARDS="emu10k1"' >> /etc/make.conf</c>
244     </note>
245    
246     <note>
247 swift 1.20 When you want to install ALSA drivers for more than one soundcard, you could
248     set ALSA_CARDS to a space-separated list of drivers; like this: <c>env
249     ALSA_CARDS='emu10k1 intel8x0 ens1370' emerge alsa-driver</c>
250 drobbins 1.1 </note>
251    
252 swift 1.20 <note>
253     If you want to have OSS compatibility, make sure to emerge <i>alsa-oss</i>, it
254     is the ALSA/OSS compatibility wrapper.
255     </note>
256 drobbins 1.1
257 swift 1.20 <note>
258     If you plan on recompiling your kernels numerous times, it might
259 swift 1.13 be adviseable to emerge <c>alsa-driver</c> with <c>--buildpkg</c>. This
260     will create a binary package for it. Later, after recompiling your kernel,
261     you can just do <c>emerge --usepkg alsa-driver</c> which will install the
262 swift 1.20 binary package instead of recompiling it completely.
263     </note>
264 swift 1.13
265 drobbins 1.1 <p>
266     After this, the ALSA modules should be installed on your system.
267     </p>
268 swift 1.20
269 drobbins 1.1 </body>
270     </section>
271     <section>
272 swift 1.20 <title>Configuration of ALSA</title>
273 drobbins 1.1 <body>
274 swift 1.20
275 drobbins 1.1 <p>
276 swift 1.20 Let's start configuring now to get ALSA working properly. We'll need to edit
277     some files, to let our system know about the freshly installed ALSA modules.
278 drobbins 1.1 </p>
279 swift 1.12
280 drobbins 1.1 <p>
281 swift 1.12 First, install <c>alsa-utils</c> on your system:
282     </p>
283    
284     <pre caption = "Emerging alsa-utils">
285     # <i>emerge alsa-utils</i>
286     </pre>
287    
288     <p>
289     Hereafter, we need to edit <path>/etc/modules.d/alsa</path>.
290 drobbins 1.1 </p>
291 swift 1.20
292 drobbins 1.1 <warn>
293 swift 1.20 There is no need to edit <path>/etc/modules.conf</path>. Instead, always edit
294     files in <path>/etc/modules.d</path>.
295 drobbins 1.1 </warn>
296 swift 1.20
297 drobbins 1.1 <p>
298 swift 1.20 Check the ALSA portion <e>at the bottom of the file</e>. By tweaking this line
299     you can specify the max number of soundcards you have (generally, just one).
300 drobbins 1.1 </p>
301 swift 1.20
302 seo 1.8 <pre caption="At the bottom of /etc/modules.d/alsa">
303 blubber 1.16 <comment>Set this to the correct number of cards.</comment>
304     options snd cards_limit=1
305 drobbins 1.1 </pre>
306 swift 1.20
307 drobbins 1.1 <p>
308 swift 1.20 Now we'll specify the sounddriver(s) ALSA should use. In the same file, edit
309     like this:
310 blubber 1.16 </p>
311 swift 1.20
312 seo 1.8 <pre caption="In /etc/modules.d/alsa">
313 bennyc 1.14 ## and then run `modules-update' command.
314 drobbins 1.1 ## Read alsa-driver's INSTALL file in /usr/share/doc for more info.
315     ##
316     ## ALSA portion
317 blubber 1.16 alias snd-card-0 snd-emu10k1
318     <comment>## If you have more than one, add:</comment>
319 drobbins 1.1 ## alias snd-card-1 snd-intel8x0
320 blubber 1.16 ## alias snd-card-2 snd-ens1370
321 drobbins 1.1 ## OSS/Free portion
322     ## alias sound-slot-0 snd-card-0
323     ## alias sound-slot-1 snd-card-1
324     ##
325     </pre>
326 swift 1.20
327 drobbins 1.1 <note>
328 swift 1.20 If you have more than one soundcard, adjust the <c>cards_limit</c> value and add
329     more snd-card aliases to the file. I don't have experience with this, but you
330     can find examples for configurations with two or more soundcards in <uri
331     link="http://www.alsa-project.org/alsa-doc/alsa-howto/c1660.htm">Chapter 6</uri>
332     of the <uri
333     link="http://www.alsa-project.org/alsa-doc/alsa-howto/alsa-howto.html">ALSA
334     Howto</uri>.
335 drobbins 1.1 </note>
336 swift 1.20
337 drobbins 1.1 <p>
338 swift 1.20 Last thing to do in this file, almost at the end, check if these lines are there
339     and uncommented:
340 blubber 1.16 </p>
341 swift 1.20
342 seo 1.8 <pre caption="Near the end of /etc/modules.d/alsa">
343 drobbins 1.1 alias /dev/mixer snd-mixer-oss
344     alias /dev/dsp snd-pcm-oss
345     alias /dev/midi snd-seq-oss
346     </pre>
347 swift 1.20
348 drobbins 1.1 <p>
349 swift 1.20 Now double-check the file <path>/etc/modules.d/alsa</path> and when you're sure
350     everyting is ok, run <c>modules-update</c>.
351     </p>
352    
353     <pre caption="Running modules-update">
354 bennyc 1.14 # <i>modules-update</i>
355 drobbins 1.1 </pre>
356 swift 1.20
357 drobbins 1.1 <note>
358 swift 1.20 Running <c>modules-update</c> here will insert the data from
359     <path>/etc/modules.d/alsa</path> into <path>/etc/modules.conf</path>
360 drobbins 1.1 </note>
361 swift 1.20
362 drobbins 1.1 <p>
363 swift 1.20 You should also verify that <path>/etc/devfsd.conf</path> has the alsa devices
364     and permissions correctly registered.
365 drobbins 1.1 </p>
366 swift 1.20
367 seo 1.8 <pre caption="/etc/devfsd.conf">
368 drobbins 1.1 # ALSA/OSS stuff
369     # Comment/change these if you want to change the permissions on
370     # the audio devices
371     LOOKUP snd MODLOAD ACTION snd
372     LOOKUP dsp MODLOAD
373     LOOKUP mixer MODLOAD
374     LOOKUP midi MODLOAD
375     REGISTER sound/.* PERMISSIONS root.audio 660
376     REGISTER snd/.* PERMISSIONS root.audio 660
377     </pre>
378 swift 1.20
379 drobbins 1.1 <note>
380 swift 1.20 Notice that devfsd.conf sets <path>/dev/sound</path> permissions to be
381     root.audio. Thus, for non-root users to use audio they will have to be part of
382     the audio group.
383 drobbins 1.1 </note>
384 swift 1.20
385 drobbins 1.1 </body>
386     </section>
387     </chapter>
388 swift 1.20
389 drobbins 1.1 <chapter>
390     <title>Starting ALSA</title>
391     <section>
392 swift 1.20 <title>Adding alsasound to a runlevel</title>
393 drobbins 1.1 <body>
394 swift 1.20
395 drobbins 1.1 <p>
396     First thing to do now, is to make ALSA startup at boottime. Like this:
397 swift 1.20 </p>
398    
399 aaby 1.22 <pre caption="Add ALSA to the boot runlevel">
400 blubber 1.16 # <i>rc-update add alsasound boot</i>
401 drobbins 1.1 </pre>
402 swift 1.20
403     <warn>
404     Note that the alsasound script should be added to the "boot" runlevel, not the
405     "default" runlevel.
406     </warn>
407    
408 drobbins 1.1 </body>
409     </section>
410     <section>
411 swift 1.20 <title>Running and unmuting</title>
412 drobbins 1.1 <body>
413 swift 1.20
414 drobbins 1.1 <p>
415 swift 1.20 Since we're Linux users, we don't want to reboot. So we'll start the alsasound
416     script manually.
417 drobbins 1.1 </p>
418 swift 1.20
419     <pre caption="Starting ALSA">
420 blubber 1.16 # <i>/etc/init.d/alsasound start</i>
421 drobbins 1.1 </pre>
422 swift 1.20
423 drobbins 1.1 <p>
424 swift 1.20 ALSA is running now. If everything is ok, you should be able to see the ALSA
425     modules loaded when running <c>lsmod</c>. However, sound won't work yet,
426 aaby 1.22 because the channels are still muted. We need <c>amixer</c> to fix this.
427 drobbins 1.1 </p>
428 swift 1.20
429 swift 1.12 <pre caption = "Running amixer">
430     # <i>amixer</i>
431 drobbins 1.1 </pre>
432 swift 1.20
433 drobbins 1.1 <warn>
434 swift 1.20 You shouldn't get this, but <e>if</e> you get an error about "amixer: Mixer
435     attach default error: No such file or directory", you should manually modprobe
436 drobbins 1.1 <c>snd-mixer-oss</c> and <c>snd-pcm-oss</c> once. After that run amixer again.
437     </warn>
438 swift 1.20
439     <pre caption="Only if you get an error when running amixer">
440 bennyc 1.15 # <i>modprobe snd-mixer-oss</i>
441     # <i>modprobe snd-pcm-oss</i>
442     # <i>amixer</i>
443 drobbins 1.1 </pre>
444 swift 1.20
445 drobbins 1.1 <p>
446 swift 1.13 If you got this far, now unmute Master and PCM channels. Some hardware
447     even requires you to unmute the center channel or even the surround
448     channel.
449 drobbins 1.1 </p>
450 swift 1.20
451 swift 1.13 <pre caption = "Unmuting channels">
452     # <i>amixer set Master 100 unmute</i>
453     # <i>amixer set PCM 100 unmute</i>
454     <comment>Only if the above doesn't succeed on its own:</comment>
455     # <i>amixer set Center 100 unmute</i>
456     # <i>amixer set Surround 100 unmute</i>
457     <comment>Test the sound:</comment>
458     # <i>aplay $KDEDIR/share/sounds/pop.wav</i> <codenote>(pop.wav is part of KDE)</codenote>
459 drobbins 1.1 </pre>
460 swift 1.20
461     <p>
462     We check to see if sound is working by using the aplay (alsa play) command. If
463     you hear a pop, then sound is indeed working. Then, adjust the volume settings
464     to your liking; the ncurses-based <c>alsamixer</c> is a great way to get them
465     "just so".
466 drobbins 1.1 </p>
467 swift 1.20
468     <p>
469     You may want to emerge <c>alsa-xmms</c> as that will provide ALSA support for
470     XMMS.
471     </p>
472    
473 drobbins 1.1 <p>
474 aaby 1.22 When you reboot your system, the <c>alsasound</c> init script will
475     properly save and restore your volume settings.
476 drobbins 1.1 </p>
477 swift 1.20
478 drobbins 1.1 </body>
479     </section>
480     </chapter>
481 swift 1.20
482 drobbins 1.1 <chapter>
483     <title>Final Notes</title>
484     <section>
485 aaby 1.22 <title>After kernel-upgrades...</title>
486 drobbins 1.1 <body>
487 swift 1.20
488     <p>
489     When you ever rebuild your kernel, or upgrade to another kernel, you'll have to
490     rebuild the ALSA modules.
491     </p>
492    
493     <p>
494     Although you might have installed <c>alsa-driver</c>, <c>alsa-libs</c> and
495     <c>alsa-utils</c>, only the first will have to be installed again, since it will
496     put the alsa modules in <path>/lib/modules/*/kernel/sound/pci/</path>.
497     </p>
498    
499 aaby 1.22 <pre caption="Needed after each kernel compile">
500 blubber 1.16 # <i>emerge alsa-driver</i>
501 drobbins 1.1 </pre>
502 swift 1.20
503 drobbins 1.1 </body>
504     </section>
505     <section>
506 swift 1.20 <title>/etc/modules.autoload</title>
507 drobbins 1.1 <body>
508 swift 1.20
509     <p>
510     You won't have to edit this file for use with ALSA. After our <c>rc-update add
511     alsasound boot</c>, our system will load the correct modules at startup.
512     </p>
513    
514     <p>
515     It's not necessary to add <c>snd-pcm-oss</c> or <c>snd-mixer-oss</c> in this
516     file. Check the <uri link="http://www.djcj.org/LAU/guide/alsbook/faq1.html">this
517     FAQ</uri> for more info.
518     </p>
519    
520 drobbins 1.1 </body>
521     </section>
522 swift 1.17 <section>
523     <title>Known bugs</title>
524     <body>
525    
526     <note>
527     This guide lags behind on the alsa-development. Chances are these bugs
528     are already fixed when you read this.
529     </note>
530    
531     <ul>
532 swift 1.20 <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 swift 1.17 </ul>
537 swift 1.21
538     </body>
539     </section>
540     <section>
541     <title>Activating Joystick Support</title>
542     <body>
543    
544     <p>
545     If your soundcard has a joystick plug, you might be interested in activating
546     joystick support for your soundcard. If so, start by verifying if your soundcard
547     driver has a joystick parameter. You can verify this by running <c>modinfo</c>
548     against 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>
554     filename: /lib/modules/2.4.22-ck2/snd-via82xx.o
555     description: "VIA VT82xx audio"
556     author: "Jaroslav Kysela &lt;perex@suse.cz&gt;"
557     license: "GPL"
558     parm: index int array (min = 1, max = 8), description "Index value for VIA 82xx bridge."
559     parm: id string array (min = 1, max = 8), description "ID string for VIA 82xx bridge."
560     parm: enable int array (min = 1, max = 8), description "Enable audio part of VIA 82xx bridge."
561     parm: 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>
563     parm: ac97_clock int array (min = 1, max = 8), description "AC'97 codec clock (default 48000Hz)."
564     parm: 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>
569     If 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">
575     alias snd-card-0 snd-via82xx
576     options snd-via82xx joystick=1
577     </pre>
578 swift 1.17
579     </body>
580     </section>
581 drobbins 1.1 <section>
582 aaby 1.22 <title>More links...</title>
583 drobbins 1.1 <body>
584 swift 1.20
585 drobbins 1.1 <p>
586     You could check these for additional info:
587     </p>
588 swift 1.20
589 drobbins 1.1 <ul>
590 swift 1.20 <li>
591     <uri link="http://www.gentoo.org/doc/en/desktop.xml">The Gentoo Linux
592     Desktop Configuration Guide</uri>
593     </li>
594     <li>
595     <uri link="http://www.alsa-project.org">ALSA Project Homepage</uri>
596     </li>
597     <li>
598     <uri link="http://www.alsa-project.org/documentation.php3">ALSA Users
599     Documentation</uri>
600     </li>
601     <li>
602     <uri link="http://www.djcj.org">ALSA Howto's and FAQ's</uri>
603     </li>
604     <li>
605     <uri link="http://tldp.org/HOWTO/Sound-HOWTO/index.html">Linux Sound
606     HOWTO</uri>
607     </li>
608     <li>
609     <uri link="http://linux-sound.org/">Sound and MIDI Software For Linux</uri>
610     </li>
611 drobbins 1.1 </ul>
612 swift 1.20
613 drobbins 1.1 </body>
614     </section>
615     </chapter>
616     </guide>

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