I see this on Ubuntu 12.10. Start with sound working, then do:
$ amixer -Dhw:0 set 'Master' mute Simple mixer control 'Master',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum Playback channels: Mono Limits: Playback 0 - 64 Mono: Playback 53 [83%] [-11.00dB] [off] Sound is muted, as expected. The same thing happens if you mute *any* channel (not just master) in alsamixer. $ amixer -Dhw:0 set 'Master' unmute Simple mixer control 'Master',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum Playback channels: Mono Limits: Playback 0 - 64 Mono: Playback 53 [83%] [-11.00dB] [on] Sound is still muted, both in reality and as shown by xfce4-volumed. If I open alsamixer, it shows master unmuted but everything else muted (if I had used alsamixer to do the muting, it would not recognize this until alsamixer is restarted). If I unmute *all* output channels (even ones I don't have anything attached to), the actual sound finally resumes (and xfce4-volumed mute indication changes) when I unmute the last one. "amixer -D pulse set Master 1+ unmute" also works to unmute all the channels. It seems that pulseaudio can't handle anything but a single system-wide mute switch, which is bad enough, and simulates multi-channel mute poorly (if muting one channel automatically mutes all, why does unmuting one not unmute all?), leaving confused mixing apps and confused users who can't see an easy way to turn their sound back on. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/496354 Title: amixer doesn't seem to unmute audio To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/496354/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
