Sound gone with 9.04

[marc]

Sandy Harris said:

> upgraded Xubuntu 8.10 to 9.04 on a core 2 duo 4 gig box Sound is via
> some on-board chip; worked fine in 7.04, 7.10, 8.04 and 8.10 with no
> significant messing about.
> 
> Amarok looks utterly different & no longer produces sound. Testing with
> movie player, no sound there either.
> 
> How do I diagnose this? Better yet, how do I fix it?

Sound management and sound diagnostics is a mess in Ubuntu, imo. I've had 
to sort a few issues out and it's been trial with a number of (randomly 
chosen) tools.

In your case, I'd start by taking a look at the various "mixers" and 
check whether anything is muted. Unmute everything and then selectively 
mute later - taking care when unmuting mics, of course.

Note that not all "mixers" will necessarily display all channels.

You might also try asking questions on #alsa. Those guys have a good rep 
for sorting things out.

-- 
Best,
Marc