[Hardy 8.04 alpha-2 pulseaudio]  I looked at /var/log/syslog.   Pulse audio 
wrote some error messages, which may be related to the system sound problem.   
I don't know enough about Pulse Audio to interpret these messages, but it seems 
that pulseaudio is not configured properly:
Dec 28 03:04:12 Northgate-U804a2 pulseaudio[5304]: main.c: Called SUID root and 
real-time/high-priority scheduling was requested in the configuration. However, 
we lack the necessary priviliges:
Dec 28 03:04:12 Northgate-U804a2 pulseaudio[5304]: main.c: We are not in group 
'pulse-rt' and PolicyKit refuse to grant us priviliges. Dropping SUID again.
Dec 28 03:04:12 Northgate-U804a2 pulseaudio[5304]: main.c: For enabling 
real-time scheduling please acquire the appropriate PolicyKit priviliges, or 
become a member of 'pulse-rt', or increase the RLIMIT_NICE/RLIMIT_RTPRIO 
resource limits for this user.
Dec 28 03:04:12 Northgate-U804a2 pulseaudio[5304]: main.c: 
setrlimit(RLIMIT_NICE, (31, 31)) failed: Operation not permitted
Dec 28 03:04:12 Northgate-U804a2 pulseaudio[5304]: main.c: 
setrlimit(RLIMIT_RTPRIO, (9, 9)) failed: Operation not permitted


** Tags added: iso-testing

-- 
system sounds not working
https://bugs.launchpad.net/bugs/162336
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