Public bug reported:
Binary package hint: pulseaudio
The problem: alsa mixer settings are restored before pulseaudio is
started, and therefore pulseaudio's maximum output is scaled downware by
the alsa mixer setting. Thus you can turn your volume all the way up in
the pulseaudio mixer and still only get half volume. To exacerbate the
problem, pulseaudio hides the underlying alsa mixer device, so you have
to kill pulseaudio to fix it.
How to reproduce:
1) Kill off pulseaudio.
2) Using ALSA mixer, set your volume to 50%
3) Reboot
4) Notice that all your sound outputs are now really quiet
5) Start alsamixer, note that you can't change anything
6) Kill pulse audio again
7) Start alsamixer again to fix the problem
8) Restart pulseaudio
9) Now everything works fine
Proposed solution: pulseaudio should set the underlying hardware mixer
devices to 100% before it starts.
** Affects: pulseaudio (Ubuntu)
Importance: Undecided
Status: New
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pulseaudio maximum volume attenuated by alsa mixer setting
https://bugs.launchpad.net/bugs/274884
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