Author: hselasky Date: Thu Mar 26 10:27:39 2015 New Revision: 280683 URL: https://svnweb.freebsd.org/changeset/base/280683
Log: MFC r280262 and r280263: Add more known bugs to the USB audio manual page. Modified: stable/8/share/man/man4/snd_uaudio.4 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 .Dt SND_UAUDIO 4 .Os .Sh NAME @@ -98,12 +98,27 @@ by The .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 +.Fx +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. +.Pp +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 +sysctls. +.Pp +The .Tn PCM -layer will panic. +framework in +.Fx +currently doesn't support the full set of USB audio mixer +controls. +Some mixer controls are only available as +.Va dev.pcm.%d.mixer +sysctls. _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
