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[Raid996 <khyaninlot@xxxxxxxxx>]

I also have the same problem, I don't know if this is relevant but I found a temporary workaround in this post (comment #15):
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/421250

I added "options snd_hda_intel model=laptop" to the end of
"/etc/modprobe.d/alsa-base.conf"

After each reboot execute:
sudo alsa force-reload

I just have to fix the volumes and I have my sound back (until the next
reboot that is), the only problem I have is that if I plug my earphones
I can listen audio both on the earplugs and in the laptop speakers, in
9.04 I could bypass this problem by selecting the type of output and
cutting out the other one (I cant use the speakers at work anyway so...
who cares). But now if I choose in the "output" tab "analog headphones"
I can't listen audio on any of the two. If I choose "Analog output" I go
back to hearing on both interfaces.

I know it's not a technical post but was hoping this could help, ask for
any output I will provide them asap.

My first post here, so I just wanna say THANKS for all your hard work, even with this kind of regression, you guys are building release after release one hell of a OS!!!
Renato Campus

-- 
[karmic] Radeon HD/RS780 Azalia  - No HDMI sound by default
https://bugs.launchpad.net/bugs/412688
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