Interesting, here is the output on my desktop while I was playing Urban
Terror.   Firefox loses sound consistently on my laptop while watching
youtube videos, I go play a video and then go another tab and begin
browsing and sound dies.

I very rarely watch youtube videos on my desktop.  I have noticed sound
on my desktop die mostly while playing urban terror.  Every time I lose
sound I have to reboot urban terror.  I have been playing Urban Terror
while all other applications are closed and didnt have an issue.  I
fired up firefox, went to a youtube video then went to run urban terror
and my sound died after 15~20 minutes.  It looks like npviewer is the
culprit or maybe pulse audio.

Hardware:

Audio device: nVidia Corporation MCP61 High Definition Audio (rev a2)
AMD Athlon(tm) 64 X2 Dual Core Processor 5600+

cat /proc/asound/version 
Advanced Linux Sound Architecture Driver Version 1.0.20.

When my sound died I was using the internal sound card:

cat /proc/asound/modules 
 0 snd_hda_intel
 1 snd_usb_audio
 2 saa7134_alsa

Interesting errors logged:

cat /var/log/messages

Dec  3 09:09:57 cinux kernel: [32189.947545] __ratelimit: 3 callbacks suppressed
Dec  3 09:09:57 cinux kernel: [32189.947549] npviewer.bin[3177]: segfault at 
ff99cd48 ip 00000000ff99cd48 sp 00000000ff8e253c error 14
Dec  3 09:13:02 cinux kernel: [32374.417571] npviewer.bin[3341]: segfault at 
ff99cd48 ip 00000000ff99cd48 sp 00000000ff91b5fc error 14
Dec  3 09:40:58 cinux kernel: [34050.263411] npviewer.bin[3593]: segfault at 
ff99cd48 ip 00000000ff99cd48 sp 00000000ffb7b49c error 14
Dec  3 10:13:20 cinux kernel: [35992.216686] npviewer.bin[4266]: segfault at 
ff99cd48 ip 00000000ff99cd48 sp 00000000ff8fd92c error 14
Dec  3 10:46:29 cinux pulseaudio[4432]: pid.c: Stale PID file, overwriting.

dmesg:

[32189.947545] __ratelimit: 3 callbacks suppressed
[32189.947549] npviewer.bin[3177]: segfault at ff99cd48 ip 00000000ff99cd48 sp 
00000000ff8e253c error 14
[32374.417571] npviewer.bin[3341]: segfault at ff99cd48 ip 00000000ff99cd48 sp 
00000000ff91b5fc error 14
[34050.263411] npviewer.bin[3593]: segfault at ff99cd48 ip 00000000ff99cd48 sp 
00000000ffb7b49c error 14
[35992.216686] npviewer.bin[4266]: segfault at ff99cd48 ip 00000000ff99cd48 sp 
00000000ff8fd92c error 14

-- 
sound is disabled
https://bugs.launchpad.net/bugs/486207
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