kern/129604: [sound] Sound stops with error: pcm0:virtual:dsp0.vp0: play interrupt timeout, channel dead

Olivier Smedts olivier at
Thu Apr 5 08:10:05 UTC 2012

The following reply was made to PR kern/129604; it has been noted by GNATS.

From: Olivier Smedts <olivier at>
To: "Conrad J. Sabatier" <conrads at>
Cc: Yuri <yuri at>, freebsd-multimedia at, 
	bug-followup at
Subject: Re: kern/129604: [sound] Sound stops with error: pcm0:virtual:dsp0.vp0:
 play interrupt timeout, channel dead
Date: Thu, 5 Apr 2012 10:06:05 +0200

 2012/4/5 Conrad J. Sabatier <conrads at>:
 > On Wed, 04 Apr 2012 14:43:59 -0700
 > Yuri <yuri at> wrote:
 >> On 04/04/2012 14:25, Conrad J. Sabatier wrote:
 >> > I've been seeing this intermittently for a very long time. =A0I've
 >> > reported it and have received a patch from the sound maintainer,
 >> > but it still occurs every so often nonetheless.
 >> >
 >> > This is a long-standing bugaboo that has yet to be fully resolved.
 >> Maybe it's a good idea if you posted this patch into the bug comments
 >> (bug-followup at so that whoever looks into it can at least
 >> see the direction the patch was going.
 >> Yuri
 > Here's the patch I got from (I forget who sent it to me!):
 > --- hdac.c =A0 =A0 =A0(revision 230571)
 > +++ hdac.c =A0 =A0 =A0(working copy)
 > @@ -1921,6 +1921,8 @@
 > =A0 =A0 =A0 =A0ctl |=3D 1 << ss;
 > =A0 =A0 =A0 =A0HDAC_WRITE_4(&sc->mem, HDAC_INTCTL, ctl);
 > + =A0 =A0 =A0 HDAC_WRITE_1(&sc->mem, off + HDAC_SDSTS,
 > =A0 =A0 =A0 =A0ctl =3D HDAC_READ_1(&sc->mem, off + HDAC_SDCTL0);
 IE |
 > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0HDAC_SDCTL_RUN;
 > --
 > Conrad J. Sabatier
 > conrads at
 > _______________________________________________
 > freebsd-multimedia at mailing list
 > To unsubscribe, send any mail to "freebsd-multimedia-unsubscribe at freebsd.=
 This patch has already been committed to 10-CURRENT and 9-STABLE :
 # svn log -r232798 sys/dev/sound/pci/hda/hdac.c
 r232798 | mav | 2012-03-10 22:58:08 +0100 (sam 10 mar 2012) | 13 lignes
 MFC r230130, r230181, r230312, r230326, r230331, r230451, r230465, r230488,
 r230507, r230511, r230513, r230532, r230537, r230551, r230554, r230571,
 r230574, r230585, r230641, r230768, r230807, r231024:
 Sync snd_hda(4) driver with HEAD.
 This includes major code refactoring, HDMI support, new volume control,
 automatic recording source selection, runtime reconfigureation, support
 for more then 4 PCM devices on controller, multichannel recording,
 additional playback/record streams, higher bandwidths support, more
 informative device names and many other things.
 Sponsored by:   iXsystems, Inc.
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