[pulseaudio-discuss] ThinkPad T-510 audio output mute LED non-workingness

[David Henningsson]

On 2015-04-13 22:50, Glenn Golden wrote:
> So the question is: Is the state of "Master Playback Switch" that you referred
> to in your response above indeed represented by the "MM/OO" display on the
> ALSA Master Playback slider, as I've assumed?

Your screenshot shows a virtual PulseAudio control. Try pressing F6 to 
select the real sound card, or start alsamixer with the "-c 0" switch 
(or "-c 1", in case "-c 0" is a HDMI card).

Otherwise, you're correct.

-- 
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic