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 -- amixer doesn't react on "toggle" (feisty) https://bugs.launchpad.net/bugs/120239 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs