What is the output from `amixer` ? If you attempt to mute a mixer
element for which there does not exist such a toggle, then you will
receive such an error as you stated.
** Changed in: alsa-utils (Ubuntu)
Importance: Undecided => Low
Assignee: (unassigned) => Ubuntu Audio Team
Status: New => Incomplete
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amixer doesn't react on "toggle" (feisty)
https://bugs.launchpad.net/bugs/120239
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