Ubuntu: Alsamixer outputs only in mono (0M or M0) : How to get stereo output?



Question:

I have been using Ubuntu 16.04 for sometime now and use Alsamixer to manage my sound settings (every restart sets my headphone to mute (MM) so it's been a ritual to first set that back to unmute (00) and carry on). By some misfortune, I pressed a key whilst in the Alsamixer UI which made my headphone slot set to Mono output (0M or M0 - switched using the m key). How do I restore it back to stereo?

M0 plays audio only in the right ear. 0M plays only in the left.

Screenshot for 0M state
Screenshot for 0M state

Screenshot for M0 state
Screenshot for M0 state


Solution:1

The solution turns out to be toggling individual output channels. You can mute left and right channels independently by using , (or <) and . (or >) respectively.


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