I think I can confirm the bug using my USB microphone: If I select the
USB device and Microphone track under Default Mixer Track Device, the
volume keys do not change the corresponding slider of the USB device in
the Volume Control panel, but the Microphone slider of the main sound
card. The gconf-editor /desktop/gnome/sound seems correct:
default_mixer_device=alsamixer:hw:1 and
default_mixer_tracks=[Microphone].
If I go back to the Default Mixer Track Device and choose the main sound
card, I see its Microphone will be selected. Back to the USB device, its
Microphone is selected. Watching gconf-editor /desktop/gnome/sound I see
it's impossible to select multiple tracks from multiple devices, which
is maybe a separate bug in control-center.
** Changed in: alsa-lib (Ubuntu)
Status: Unconfirmed => Confirmed
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cannot adjust headset volume with keyboard or headset
https://bugs.launchpad.net/bugs/116929
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