I'm also experiencing this bug on a Dell Inspiron 1720.

j...@thor:/var/log$ uname -a
Linux thor 2.6.30-02063005-generic #02063005 SMP Mon Aug 17 09:46:11 UTC 2009 
x86_64 GNU/Linux

j...@thor:/var/log$ lspci | grep Audio
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio 
Controller (rev 02)


Under 2.6.28 "max" volume on the laptop seems appropriate from past releases.  
Under 2.6.30, the sound is noticably lower even under maximum settings.  

j...@thor:/var/log$ apt-cache policy alsa-base
alsa-base:
  Installed: 1.0.18.dfsg-1ubuntu8
  Candidate: 1.0.18.dfsg-1ubuntu8

j...@thor:/var/log$ apt-cache policy pulseaudio
pulseaudio:
  Installed: 1:0.9.14-0ubuntu20.2
  Candidate: 1:0.9.14-0ubuntu20.2

I might try updating alsa, if I can find an easy way to do so.
Pulseaudio might also need an update to work with the new kernel.

Interesting enough, both computers I use, one with a SigmaTel HDA codec
and another with another HDA codec always seem to have a lower volume
than under Windows Vista, and Windows 7 respectively.

If you need any further info please let me know. I plan on continuing to
use this kernel, or possibly updating to 2.6.31 when its released.  If
2.6.31 solves the issue I'll post as well. Thanks.

-- 
after updating to kernel 2.6.30, audio volume is low
https://bugs.launchpad.net/bugs/398548
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