[pulseaudio-discuss] Change sound via acpid

[John W]

On 12/30/15, John W <jwdevel at gmail.com> wrote:
> On 12/22/15, Tanu Kaskinen <tanuk at iki.fi> wrote:
>>
>> amixer -c0 set Master toggle
>>
>> "-c0" may refer to the wrong sound card, though (and it may refer to a
>> different sound card after rebooting). "-cNAME" is better, where NAME
>> is the sound card name shown in brackets in /proc/asound/cards.
>>
>
> I have tried the "-c" option, and it has ... "sort of" success (:
>
> ...
>
> I am not at the machine right now, but can provide the full output
> from that process later.
>

Here's that behavior I was describing:

    $ amixer get Master   # run as the "normal" user, who spawned pulseaudio
    Simple mixer control 'Master',0
      Capabilities: pvolume pswitch pswitch-joined
      Playback channels: Front Left - Front Right
      Limits: Playback 0 - 65536
      Mono:
      Front Left: Playback 65536 [100%] [on]
      Front Right: Playback 65536 [100%] [on]
    $ # I can hear sound right now
    $ sudo amixer -c 0 set Master mute
    Simple mixer control 'Master',0
      Capabilities: pvolume pvolume-joined pswitch pswitch-joined
      Playback channels: Mono
      Limits: Playback 0 - 127
      Mono: Playback 127 [100%] [0.00dB] [off]
    $ # I hear no sound - this is good!
    $ sudo amixer -c 0 set Master unmute
    Simple mixer control 'Master',0
      Capabilities: pvolume pvolume-joined pswitch pswitch-joined
      Playback channels: Mono
      Limits: Playback 0 - 127
      Mono: Playback 127 [100%] [0.00dB] [on]
    $ # Alas, it is still muted ):
    $ amixer get Master
    Simple mixer control 'Master',0
      Capabilities: pvolume pswitch pswitch-joined
      Playback channels: Front Left - Front Right
      Limits: Playback 0 - 65536
      Mono:
      Front Left: Playback 65536 [100%] [off]
      Front Right: Playback 65536 [100%] [off]
    $ # Notice the [off] for the L/R outputs, above
    $ amixer set Master unmute
    Simple mixer control 'Master',0
      Capabilities: pvolume pswitch pswitch-joined
      Playback channels: Front Left - Front Right
      Limits: Playback 0 - 65536
      Mono:
      Front Left: Playback 65536 [100%] [on]
      Front Right: Playback 65536 [100%] [on]
    $ # Now, I can hear sound again. But I had to run a non-root
command to do that.

-John