Bug#660994: [3.1.8 -> 3.2.4 regression] Mute with Pulseaudio ignored on a Thinkpad T500

[Jonathan Nieder <jrnieder@gmail.com>]

S. G. wrote:

> alsamixer offers no mute knob on the master channel with kernel 3.2.6, see below.
[...]
> With kernel 3.1.8 there is a mute knob on the master channel.

Oh, good find.  I should have noticed that the 'Master Playback
Switch' had disappeared in your alsactl output.

> How to proceed?

Please report this upstream using bugzilla.kernel.org, product
Drivers, component Sound (ALSA), as described in my last message, and
let us know the bug number so we can track it.  Simple reproduction
recipe that does not involve pulseaudio: run "alsamixer -c0" and check
if the "mute" knob has gone missing.

Sorry for the confusion.
Jonathan