On my machine all symptoms are exactly the same, so I consider this bug to be the same one.
In my case "amixer set Master toggle" toggles 2 channels (namely Master and PCM) but unmutes only one (Master, PCM stays muted). "amixer set PCM toggle" behaves similarly - mutes both Master and PCM, but unmutes only PCM. All mentioned is also true with sset and mute/unmute commands. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/878986 Title: amixer -q sset Master toggle does mute, but does not unmute! To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-utils/+bug/878986/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs