If the Master channel has no effect on the sound card, then the default control has to be switched. Use gnome-alsamixer or alsamixer to test. GNOME does not provide a means to switch default mixer controls, so here is how to switch the mixer(s) affected by a multimedia key although the volume bar (screenshot attached) will stop appearing:
- Open the Trisquel menu.
- Pick System Settings.
- Go to Keyboard.
- Switch to the other tab: Shortcuts.
- Click Custom Shortcuts.
- Click the plus button.
- Give the shortcut a name like "PCM up".
- Enter a command, like "
amixer set PCM 1+
". This will raise the volume as much as alsamixer would after pressing the up arrow key. 2+
is also suitable, but 5+
is probably too much.
- Apply.
- Click Disabled.
- Use the multimedia key as though it would increase the volume.
- Press Reassign.
- Repeat steps 6 through 12 for the "PCM down" shortcut, but use a minus instead of a plus symbol in step 8, i.e.,
amixer set PCM 1-
- For another control like Headphone, repeat these steps, but hold down the
Ctrl
key while using the multimedia key.
Revisions
02/21/2014 - 20:16

04/14/2014 - 03:51

09/06/2014 - 22:59

09/22/2024 - 14:23
