svn commit: r280683 - stable/8/share/man/man4

Hans Petter Selasky hselasky at
Thu Mar 26 10:27:41 UTC 2015

Author: hselasky
Date: Thu Mar 26 10:27:39 2015
New Revision: 280683

  MFC r280262 and r280263:
  Add more known bugs to the USB audio manual page.

Directory Properties:
  stable/8/share/   (props changed)
  stable/8/share/man/   (props changed)
  stable/8/share/man/man4/   (props changed)

Modified: stable/8/share/man/man4/snd_uaudio.4
--- stable/8/share/man/man4/snd_uaudio.4	Thu Mar 26 10:26:25 2015	(r280682)
+++ stable/8/share/man/man4/snd_uaudio.4	Thu Mar 26 10:27:39 2015	(r280683)
@@ -36,7 +36,7 @@
 .\" $FreeBSD$
-.Dd February 24, 2011
+.Dd March 19, 2015
@@ -98,12 +98,27 @@ by
 .Tn PCM
 framework in
-.Fx ,
-as of this writing, does not handle device un-registrations in a properly
-abstracted manner, i.e., a detach request is refused by the
-.Tn PCM
-framework if the device is in use.
-It is necessary to allow the device un-registration to complete
-successfully, otherwise the
+only supports synchronous device detach.
+That means all mixer and DSP character devices belonging to a given
+USB audio device must be closed when receiving an error on a DSP read,
+a DSP write or a DSP IOCTL request.
+Else the USB audio driver will wait for this to happen, preventing
+enumeration of new devices on the parenting USB controller.
+Some USB audio devices might refuse to work properly unless the sample
+rate is configured the same for both recording and playback, even if
+only simplex is used.
+See the
+.Va dev.pcm.%d.[play|rec].vchanrate
 .Tn PCM
-layer will panic.
+framework in
+currently doesn't support the full set of USB audio mixer
+Some mixer controls are only available as
+.Va dev.pcm.%d.mixer

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