Claude M. Schrader on 2 Jul 2012 09:57:17 -0700

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Re: [PLUG] When unmute isn't

On 00:01 Mon 02 Jul     , jeff wrote:
> I adore the challenge of operating strictly by keyboard.  At one
> point I had to turn the volume up and hit MUTE by mistake.  So I
> unmuted and made the volume adjustment, only I couldn't hear
> anything.  I plugged headphones in and noted that the onscreen
> graphic indicated MUTE.  I unmuted again, with similar results.
> No amount of muting and unmuting would produce sound.  So much for
> all the work I had to do.
> When I got home, I followed a hunch and visited the speaker icon on
> the taskbar (Xubuntu).  There I had about FOUR choices of
> hardware/software to make volume adjustments:
> HDA ATI SB (Alsa mixer)
> HDA ATI HDMI (Alsa mixer)
> Playback: RS880 HDMI audio [Radeon HD4200 series] Digital Stereo
> HDMI (PulseAudio Mixer)
> Playback: Built-in Audio Analog Stereo (PulseAudio Mixer)
> And the winner was the last one, which had become muted and wouldn't
> unmute with the hardware controls.
> Is there an actual good reason for this?

That's the actual mixed output that may include all the various possible
sources listed earlier like HDMI, CDROM, and line in. 

For what it's worth next time, you can just run the `alsamixer` command in
a terminal, and hit `m` when your mixer is selected
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