Red Hat Bugzilla – Bug 478579
Sound suddenly disappears (possibly ALSA driver bug, wakeup without write)
Last modified: 2009-12-18 02:27:08 EST
Created attachment 328033 [details]
pulseaudio -vvv output
Description of problem:
I expect frequent disappeance of sound on my machine, attached is a log of pulseaudio run with -vvv. I have noticed that sometimes this problem is preceeded with a message saying something like ALSA driver woke us up to write data but nothing found. This however is not always the case. This happens very frequently and requires a full restart of pulseaudio to restore working audio everytime.
It does seem to happen more often when playing movies for some reason.
The soundcard is a SB 5.1 Live! external USB
Version-Release number of selected component (if applicable):
100% (takes anywhere from seconds to hours to reproduce)
Steps to Reproduce:
1. Start totem
2. play movie
sound disappears after a while
rock solid audio experience
Further research seems to indicate that activity on USB might cause this. When I hook up a USB stick or conduct trafic on my external USB harddrive sound disappers. Maybe the USB soundcard is being starved?
Hmm, smells like a driver bug.
The log you showed shows no messages related to this problem, or am I blind? You say that PA runs normally but audio suddenly goes silent?
The wakeup issue is an ALSA driver issue and has been reported many times already.
sound completely disappears, however the PA volume control application still registers the stream and shows that there is output.
I suspect that this happens because the soundcard is on USB and my external storage is as well. Where there is a lot of activity such as copying files back and forth over the USB the sound tends to disappear.
OK, I am reassigning this to the kernel then, since that's where the USB audio driver is part of.
I think this upstream bug might be it:
The symptomes seem to match, copying stuff over USB stalls the system till the operation has ended (comment 14).
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