Public bug reported:
Binary package hint: gnome-control-center
In the Gnome Sound Preferences dialog box, one can choose which audio
channel will be controlled by the keyboard volume control hotkeys. I've
noticed a peculiar behaviour with my notebook's sound card (Intel HDA).
I'm controlling the 'front' channel with the hotkeys. Normally, when I
plug in the headphones, the front channel gets automatically muted. With
the front channel muted, no sound comes through the system speakers, but
the volume level still controls the audio volume of the headphones.
Manually unmuting the front channel while the headphone is connected
enables audio output from both the headphones and speakers (which I
would not want in normal circumstances).
The problem I'm seeing is that when I'm using the hotkeys to control the front
channel:
1. Pressing the volume down key reduces the volume while keeping the muted
channel muted.
2. Pressing the volume up key raises the volume, but also unmutes the channel
if it is muted.
So, if I'm listening via the headphones, I can safely reduce the volume
from the keyboard, but if I try to increase the volume, audio starts
playing from both the headphones and speakers! I have to mute the front
channel manually then to keep the sound playing through the headphones
only. I don't understand why the behaviour of the volume up and down
keys is asymmetric... the volume up key should also simply adjust the
volume level, and not disable the mute flag.
** Affects: gnome-control-center (Ubuntu)
Importance: Undecided
Status: New
--
Volume up keyboard hotkey unmutes channel, while volume down doesn't
https://bugs.launchpad.net/bugs/139887
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