Note that I had sound with the 2.6.20-10-generic kernel, and not any more from -11 onwards. One difference that I found were the audio devices used:
-10: (with sound) Audio devices: HDA Generic Mixers: Realtek ID862
-11, -12,-13: (no sound) Audio devices: ALC861VD Analog (Duplex) Mixers: Realtek ALC861VD
Hope it helps!
Note that I had sound with the 2.6.20-10-generic kernel, and not any more from -11 onwards. One difference that I found were the audio devices used:
-10: (with sound)
Audio devices: HDA Generic
Mixers: Realtek ID862
-11, -12,-13: (no sound)
Audio devices: ALC861VD Analog (Duplex)
Mixers: Realtek ALC861VD
Hope it helps!