Date: Sun, 7 Aug 2005 16:18:27 +1000 (EST) From: Sam Lawrance <lawrance@FreeBSD.org> To: FreeBSD-gnats-submit@FreeBSD.org Subject: docs/84639: pcm.4, handbook - note that vchan settings can't be changed while device in use Message-ID: <20050807061827.AB2558571@localhost> Resent-Message-ID: <200508070650.j776oKMW081696@freefall.freebsd.org>
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>Number: 84639
>Category: docs
>Synopsis: pcm.4, handbook - note that vchan settings can't be changed while device in use
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-doc
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: doc-bug
>Submitter-Id: current-users
>Arrival-Date: Sun Aug 07 06:50:19 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator: Sam Lawrance
>Release: FreeBSD 5.4-STABLE i386
>Organization:
>Environment:
System: FreeBSD dirk.no.domain 5.4-STABLE FreeBSD 5.4-STABLE #0: Sat Jun 11 21:44:19 EST 2005 sam@dirk.no.domain:/usr/obj/usr/src/sys/DIRK i386
>Description:
I was following the handbook in setting up virtual sound channels.
When the hw.snd.pcm0.vchans sysctl did not appear in my list, I checked into
it a little. It seems that that this sysctl is not available when the sound
device is in use.
I think a note should be made of this, particularly for new users who are
setting up and playing around with sound devices.
>How-To-Repeat:
1. Run xmms and play "Groove Armada - Lovebox" :-)
2. Run sysctl hw.snd.pcm0.vchans
>Fix:
Patch for pcm manpage:
Index: pcm.4
===================================================================
RCS file: /home/ncvs/src/share/man/man4/pcm.4,v
retrieving revision 1.39
diff -u -r1.39 pcm.4
--- pcm.4 22 May 2005 15:25:14 -0000 1.39
+++ pcm.4 7 Aug 2005 06:03:22 -0000
@@ -236,7 +236,8 @@
.Dq 0
will disable
.Tn VCHANs
-for this device.
+for this device. This setting is not available while the specified
+device is in use.
.El
.Ss Recording Channels
On devices that have more than one recording source (ie: mic and line),
Patch for handbook multimedia section:
Index: chapter.sgml
===================================================================
RCS file: /home/ncvs/FreeBSD/doc/en_US.ISO8859-1/books/handbook/multimedia/chapter.sgml,v
retrieving revision 1.107
diff -u -r1.107 chapter.sgml
--- chapter.sgml 6 Jun 2005 10:04:50 -0000 1.107
+++ chapter.sgml 7 Aug 2005 05:53:44 -0000
@@ -436,6 +436,12 @@
virtual channels any devices which are attached later will be
given.</para>
+ <note>
+ <para>You cannot change the number of virtual channels for a
+ device while it is in use. First close any programs using the
+ device, such as music players or sound daemons.</para>
+ </note>
+
<para>If you are not using &man.devfs.5;, you will have to point
your applications at <filename>/dev/dsp0</filename>.<replaceable>x</replaceable>, where
<replaceable>x</replaceable> is 0 to 3 if <varname>hw.snd.pcm.0.vchans</varname> is set
>Release-Note:
>Audit-Trail:
>Unformatted:
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