On further investigation. Looks similar to Bug #1026331 (duplicate of
#878986). Which, according to the comments on the latter is a Pulseaudio
issue.
Fixed (or rather triaged) by using
amixer -D pulse set Master toggle
(which worked for me)
or using
pactl set-sink-mute 0
(which wouldn't recogn
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: alsa-utils (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bug
Also affects Ubuntu 14.04 Vanilla (running standalone Xmonad Window
Manager, not Unity Desktop on Acer Aspire One D260).
amixer -q sset Master toggle (or Master,0) also mutes Headphone and
Speaker but does not unmute Headphone and Speaker when run again to
unmute.
Problem persists whether system
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