Problem solved. I have edited the file /etc/modprobe.d/alsa-base.conf and I wrote in that file: options snd-hda-intel model=acer
I used these link: http://doc.ubuntu-fr.org/audio_intel_hda It's in French language but the useful informations are in the arrays.Now I use squeeze (instead of sid) but it was the kernel 2.6.32 which causes the problem.
hth. -- Gérard
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