[Bug 579117] Re: Wireless blocks USB-Audio, leading to dropouts

[Chris Hermansen]

I see in reading your response I have mislead you slightly - the Kubuntu
test DID SHOW noise floor calibration timeouts; just no (apparent)
disturbance of alsa / pulse.

I do not see a linux-preempt in lucid synaptic... I changed to the main
server in case there was something weird there... but no preempt.  Is
there some other repo I need to enable?  According to the wiki page on
this kernel, it should be there...

So I tried linux-rt.  This is a bit older kernel 2.6.31-11-rt.  The
machine booted ok; I logged in, started the log viewer, started
rhythmbox (which crashed, uh-oh).  So I then started Exaile (which
worked) and started playing some music.

In the log file: no messages whatsoever about noise floor calibration
timeouts.  On about the 5th song, I saw this:

Jul  4 09:58:34 temuko pulseaudio[4344]: alsa-sink.c: ALSA woke us up to write new data to the device, but there was actually nothing to write!
Jul  4 09:58:34 temuko pulseaudio[4344]: alsa-sink.c: Most likely this is a bug in the ALSA driver 'snd_usb_audio'. Please report this issue to the ALSA developers.
Jul  4 09:58:34 temuko pulseaudio[4344]: alsa-sink.c: We were woken up with POLLOUT set -- however a subsequent snd_pcm_avail() returned 0 or another value < min_avail.

Watching latencytop, I get no long latencies for waiting for cpu;
they're all in the 25-35ms range now.  I started up a bunch of stuff
(web browser, etc) and got some longer latencies then (writing a page to
disk 232ms, reading from file 139ms, page fault 102ms, fsync on a file
100ms).

-- 
Wireless blocks USB-Audio, leading to dropouts
https://bugs.launchpad.net/bugs/579117
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