I have a HP 625 with 
00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA) (rev 40)
01:05.1 Audio device: ATI Technologies Inc RS880 Audio Device [Radeon HD 4200]
It worked well on Ubuntu 11.04 but internal speakers stopped working after 
uppgrading to 11.10 while 
head phone output works if RS880 (Radeon HD 4200) HDMI is disabled. 

peha@phratora-4:~$ uname -a
Linux phratora-4 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:56:25 UTC 2011 
x86_64 x86_64 x86_64 GNU/Linux

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

Title:
  Erratic sound support with SBx00 Azalia(IDT 92HD88B1, 103c:1475)

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