[Bug 58751] Re: Mute Key showing OSD but is not working

[BenjaminKoenig]

Well, mute doesn't work on both laptop speakers and headphone.
When pressing the mute key nothing changes in kmix.
I have two channels, PCM and Front which control sound output.
The key for lower/higher volume is changing the PCM channel.
Appearently the PCM channel can't be muted - even in kmix.
Is that normal?
Seems that if all FN keys for sound were asigned to the Front channel,
everything would work.

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Mute Key showing OSD but is not working
https://launchpad.net/bugs/58751