Interesting, alsamixer can't mute/unmute PCM, but it can mute/unmute other controls like Master and LFE.
Please look attached screenshot: Master and LFE have a square with "00", which turns to "MM" when muted (like IEC958). PCM doesn't have this square, and pressing "m" to change muted state has no effect in this control.
Interesting, alsamixer can't mute/unmute PCM, but it can mute/unmute other controls like Master and LFE.
Please look attached screenshot: Master and LFE have a square with "00", which turns to "MM" when muted (like IEC958). PCM doesn't have this square, and pressing "m" to change muted state has no effect in this control.