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I was trying some of the solutions published in this forum for the same problem, but just one in particular work for me: add the line of code in the file alsa-base.conf. This just works for a few days, now the problem is back again.

Any solution to fix this problem for good?

Compaq Presario CQ40

$ lspci | grep -i audio
00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)
01:05.1 Audio device: ATI Technologies Inc RS780 Azalia controller
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Can you please add links to the answers you already tried out? – Takkat Jun 21 '11 at 6:18
What I have tried this time in addition to what worked for me a few days is to create a sound.conf file in the same directory of alsa-base.conf, I also set the alsamixer without success. But in the past I've tried to update alsa drivers without being able to solve the problem. __--… – Joel Lino Jun 21 '11 at 22:23

I have the same problem, but I have solution, not a very good one, but the only one that works for me (DELL Vostro 3750) Ubuntu 11.04. When I boot in Ubuntu and I do not have sound in headphones I press Power button and hold it until laptop turns off (Forced Power Off). Then when I boot back in Ubuntu there is sound in headphones and stays that way until I do normal reboot.

P.S. In 11.10 this problem is fixed.

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