Here is the solution for the bugs above, I tried it on mine, Ubuntu 9.04
it works.
1. Type the following command into the Terminal. (Applications ->
Accessories -> Terminal)
gedit /etc/modprobe.d/alsa-base.conf
2. Add these lines to the end of the file:
# Keep snd-pcsp from being loaded as first soundcard
options snd-pcsp index=-2
alias snd-card-0 snd-hda-intel
alias sound-slot-0 snd-hda-intel
options snd-hda-intel model=dell-m4-1
options snd-hda-intel enable_msi=1
3. Navigate to System -> Preferences -> Sound and change everything to ALSA
Ubuntu Sound Preferences
4. Go back to your Terminal and type in this
vim /etc/group
5. Replace the following line: (or something very similar to it)
audio:x:29:pulse
with this
audio:x:29:<your Ubuntu login name>,pulse
6. Reboot and test your sound. :)
For more detail please check here:
http://idavespot.com/laptop/ubuntu-904-no-sound-on-hp-compaq-cq40/
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Hp-compaq notebook,no sound in ubuntu 9.04
https://bugs.launchpad.net/bugs/360137
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