Comment 13 for bug 535586

After installing linux-alsa-driver-modules-2.6.31-20-generic, according to my kernel version, i can adjust the volume again and flash in firefox works, too.
One problem remains: When i plug in my headphones, the internal speakers are not muted.
I think the problem is related to the following issue: In AlsaMixer for playback devices, I can see (amongst others) Master Front, Headphone, PCM, Front, Front Mic and Mic. The "Master" slide behaves correctly (the overall volume is controlled), the "Headphone" slide is without function (the value has no effect on the headphone's volume), "PCM" also controls overall volume, "Front" controls both, internal speakers and headphones, "Front Mic" doesn't affect normal playback, but "Mic" behaves like an alternative slide for "Master" (If the last volume setting is made with "Master", it's value is taken, if the last volume setting is made with "Mic", the "Mic"-value is taken).