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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 1.57 2005/07/14 19:22:54 fox2mike Exp $ --> 2<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/alsa-guide.xml,v 1.58 2005/07/16 11:45:41 alin Exp $ -->
3 3
4<!DOCTYPE guide SYSTEM "/dtd/guide.dtd"> 4<!DOCTYPE guide SYSTEM "/dtd/guide.dtd">
5 5
6<guide link="/doc/en/alsa-guide.xml"> 6<guide link="/doc/en/alsa-guide.xml">
7<title>Gentoo Linux ALSA Guide</title> 7<title>Gentoo Linux ALSA Guide</title>
8 8
9<author title="Author"> 9<author title="Author">
10 <mail link="fox2mike@gentoo.org">Shyam Mani</mail> 10 <mail link="fox2mike@gentoo.org">Shyam Mani</mail>
11</author> 11</author>
12 12
13<abstract> 13<abstract>
14This document helps a user setup ALSA on Gentoo Linux. 14This document helps a user setup ALSA on Gentoo Linux.
15</abstract> 15</abstract>
16 16
17<!-- The content of this document is licensed under the CC-BY-SA license --> 17<!-- The content of this document is licensed under the CC-BY-SA license -->
18<!-- See http://creativecommons.org/licenses/by-sa/2.5 --> 18<!-- See http://creativecommons.org/licenses/by-sa/2.5 -->
19<license/> 19<license/>
20 20
21<version>2.6</version> 21<version>2.7</version>
22<date>2005-07-14</date> 22<date>2005-07-16</date>
23 23
24<chapter> 24<chapter>
25<title>Introduction</title> 25<title>Introduction</title>
26<section> 26<section>
27<title>What is ALSA?</title> 27<title>What is ALSA?</title>
28<body> 28<body>
29 29
30<p> 30<p>
31ALSA, which stands for <e>Advanced Linux Sound Architecture</e>, provides 31ALSA, which stands for <e>Advanced Linux Sound Architecture</e>, provides
32audio and MIDI (<e>Musical Instrument Digital Interface</e>) functionality to 32audio and MIDI (<e>Musical Instrument Digital Interface</e>) functionality to
33the Linux operating system. ALSA is the default sound subsystem in the 2.6 33the Linux operating system. ALSA is the default sound subsystem in the 2.6
34kernel thereby replacing OSS (<e>Open Sound System</e>), which was used in the 34kernel thereby replacing OSS (<e>Open Sound System</e>), which was used in the
352.4 kernels. 352.4 kernels.
36</p> 36</p>
37 37
531 531
532<p> 532<p>
533Now that the required things have been taken care of, we need to check up on 533Now that the required things have been taken care of, we need to check up on
534the volume as in certain cases, it is muted. We use <c>alsamixer</c> for this 534the volume as in certain cases, it is muted. We use <c>alsamixer</c> for this
535purpose. 535purpose.
536</p> 536</p>
537 537
538<pre caption="Starting alsamixer"> 538<pre caption="Starting alsamixer">
539<comment>(Opens up a console program. Only required settings are shown)</comment> 539<comment>(Opens up a console program. Only required settings are shown)</comment>
540# <i>alsamixer</i> 540# <i>alsamixer</i>
541</pre> 541</pre>
542 542
543<impo> 543<impo>
544If you have issues starting up <c>alsamixer</c> and get errors such as 544If you have issues starting up <c>alsamixer</c> and get errors such as
545alsamixer: function snd_ctl_open failed for default: No such file or directory, 545alsamixer: function snd_ctl_open failed for default: No such file or directory,
546this is usually an issue with udev setting up the devices. Run <c>killall -9 546this is usually an issue with udev setting up the devices. Run <c>killall
547udevd; udevstart</c> to reload /dev entries and fire up <c>alsamixer</c>. It 547udevd; udevstart</c> to reload <path>/dev</path> entries and fire up
548should solve the issue. 548<c>alsamixer</c>. It should solve the issue.
549</impo> 549</impo>
550 550
551<p> 551<p>
552This is how the ALSA Mixer <e>might</e> look the first time you open it. Pay 552This is how the ALSA Mixer <e>might</e> look the first time you open it. Pay
553attention to the Master and PCM channels which both have an MM below them. 553attention to the Master and PCM channels which both have an MM below them.
554That means they are muted. If you try to play anything with <c>alsamixer</c> 554That means they are muted. If you try to play anything with <c>alsamixer</c>
555in this state, you will not hear anything on your speakers. 555in this state, you will not hear anything on your speakers.
556</p> 556</p>
557 557
558<figure link="/images/docs/alsa-mixermuted.png" short="AlsaMixer Muted" caption="The Alsa Mixer Main Window, Muted"/> 558<figure link="/images/docs/alsa-mixermuted.png" short="AlsaMixer Muted" caption="The Alsa Mixer Main Window, Muted"/>
559 559
560<p> 560<p>
561Now, we shall unmute the channels, and set volume levels as needed. 561Now, we shall unmute the channels, and set volume levels as needed.
562</p> 562</p>
563 563

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