Attachment 113686 Details for Bug 155264 – multimedia.chapter.sgml.diff

[patch] multimedia.chapter.sgml.diff

multimedia.chapter.sgml.diff (text/plain), 2.27 KB, created by Niclas Zeising on 2011-05-23 14:58:18 UTC

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Creator: Niclas Zeising

Created: 2011-05-23 14:58:18 UTC

Size: 2.27 KB

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obsolete

>Index: chapter.sgml
>===================================================================
>RCS file: /home/ncvs/doc/en_US.ISO8859-1/books/handbook/multimedia/chapter.sgml,v
>retrieving revision 1.141
>diff -u -d -r1.141 chapter.sgml
>--- chapter.sgml	3 Mar 2011 16:21:59 -0000	1.141
>+++ chapter.sgml	23 May 2011 13:29:32 -0000
>@@ -353,6 +353,38 @@
>           </tbody>
>         </tgroup>
>       </informaltable>
>+      <para>Another issue is that modern graphics cards often comes with their
>+	own sound driver, for use with <acronym>HDMI</acronym> and similar. This
>+	sound device will sometimes be enumerated before the actual soundcard
>+	and the soundcard will subsequently not be used as the default playback
>+	device.  To check if this is the case, run
>+	<application>dmesg</application> and look for <literal>pcm</literal>.
>+	The output looks something like this:</para>
>+	<programlisting>...
>+hdac0: HDA Driver Revision: 20100226_0142
>+hdac1: HDA Driver Revision: 20100226_0142
>+hdac0: HDA Codec #0: NVidia (Unknown)
>+hdac0: HDA Codec #1: NVidia (Unknown)
>+hdac0: HDA Codec #2: NVidia (Unknown)
>+hdac0: HDA Codec #3: NVidia (Unknown)
>+pcm0: &lt;HDA NVidia (Unknown) PCM #0 DisplayPort&gt; at cad 0 nid 1 on hdac0
>+pcm1: &lt;HDA NVidia (Unknown) PCM #0 DisplayPort&gt; at cad 1 nid 1 on hdac0
>+pcm2: &lt;HDA NVidia (Unknown) PCM #0 DisplayPort&gt; at cad 2 nid 1 on hdac0
>+pcm3: &lt;HDA NVidia (Unknown) PCM #0 DisplayPort&gt; at cad 3 nid 1 on hdac0
>+hdac1: HDA Codec #2: Realtek ALC889
>+pcm4: &lt;HDA Realtek ALC889 PCM #0 Analog&gt; at cad 2 nid 1 on hdac1
>+pcm5: &lt;HDA Realtek ALC889 PCM #1 Analog&gt; at cad 2 nid 1 on hdac1
>+pcm6: &lt;HDA Realtek ALC889 PCM #2 Digital&gt; at cad 2 nid 1 on hdac1
>+pcm7: &lt;HDA Realtek ALC889 PCM #3 Digital&gt; at cad 2 nid 1 on hdac1
>+...</programlisting>
>+      <para> Here the graphics card (<literal>NVidia</literal>) has been
>+	enumerated before the sound card (<literal>Realtek ALC889</literal>).
>+	To use the sound card as default playback device, change
>+	<literal>hw.snd.default_unit</literal> to the unit that should be used
>+	for playback, using
>+	<screen>&prompt.root; <userinput>sysctl hw.snd.default_unit=n</userinput></screen>
>+	where <literal>n</literal> is the number of the sound device to use, in
>+	this example <literal>4</literal>.</para>
>     </sect3>
>   </sect2>
>

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