I did 3 things to get karmic beta to behave (so far reliably with both sound 
and timidity working) on my Dell Mini 10v netbooks. 
This system has:

 Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 
02)
 Codec: Realtek ALC272

 In /etc/modprobe.d/alsa-base.conf I added:

 options snd-hda-intel model=auto

and commented out:

 options snd-hda-intel power_save=10

In /etc/rc.local (before 'exit 0') I added:
 alsa force-reload

BTW: my problems only started when I fixed the timidity startup by doing
a 'chown timidity.timidity -R /etc/timidity/'. Otherwise timidity
startup complained about it's homedir not being owned by itself.
However, by removing that chown fix the sound problem persisted until I
did the above :-| I guess the problem might also have been triggered by
adding ubuntustudio-audio-plugins and canorus packages...

-- 
[karmic] No sound on Intel 82801H HD Audio
https://bugs.launchpad.net/bugs/411574
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