I have the same problem with Ubuntu 10.04 on Compaq CQ41-110AU
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$ lspci | grep Audio
00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)
01:05.1 Audio device: ATI Technologies Inc RS880 Audio Device [Radeon HD 4200]
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When I connect headphones, internal speakers won't mute. The headphones works 
when I restart ubuntu. But when I disconnect headphones, no sound out from 
internal speakers.
I hope ubuntu Audio Team solve this issue as soon as possible.
Thanks.

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https://bugs.launchpad.net/bugs/513069

Title:
  ATI Technologies Inc RS880 Audio Device [Radeon HD 4200] very erratic

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