I can confirm there are audio problems in Karmic.

I have an HDA Intel ICH8 chipset and the headphone channel is muted
after every reboot. gnome-volume-control's doesn't unmute this channel
if I select headphones as the output. Unfortunately the headphones
channel is actually chained with the PCM channel, so there is never any
sound after reboot until I unmute the channel with alsamixer.

If I mute headphones from alsa-mixer, it also mutes master and gnome-
volume-control recognises it is muted. If I unmute both from alsa-mixer,
gnome-volume-control doesn't detect it and there is still no sound until
I unmute gnome-volume-control (which must be a pulseaudio issue).

Furthermore, totem always reduces the volume at start and end of
playback... but that's the subject of another bug.

In Jaunty, I run the 2.6.30.4 kernel. It has the same alsa-driver
(1.0.20) as Karmic's kernel and hence detects the same channels as
Karmic. The main difference is that it doesn't mute anything on reboot.
So this is a regression in Karmic.

-- 
[Karmic] No sound with jack output now with PulseAudio 1:0.9.16~test4-0ubuntu1
https://bugs.launchpad.net/bugs/409759
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