Public bug reported:
The default keybindings for changing the volume in Lubuntu are found in
/usr/share/lubuntu/openbox/rc.xml:
<!-- Keybinding for Volume management -->
<keybind key="XF86AudioRaiseVolume">
<action name="Execute">
<command>amixer -q sset Master 3%+ unmute</command>
</action>
</keybind>
<keybind key="XF86AudioLowerVolume">
<action name="Execute">
<command>amixer -q sset Master 3%- unmute</command>
</action>
</keybind>
<keybind key="XF86AudioMute">
<action name="Execute">
<command>amixer -q sset Master toggle</command>
</action>
</keybind>
If you are running Lubuntu on a laptop (which has the built-in audio
card with analog audio), those commands work correctly.
However, when you switch the audio to HDMI, those commands do not work
anymore.
To switch to HDMI audio:
pacmd set-card-profile 0 output:hdmi-stereo+input:analog-stereo
To switch back to analog audio:
pacmd set-card-profile 0 output:analog-stereo+input:analog-stereo
Alternatively, right-click on the speaker icon at lxpanel, select
"Volume Control Settings", and change the active profile at the
"Configuration" tab.
The solution for this bug is quite simple: just add "-D pulse" to each of those
commands, like this:
<!-- Keybinding for Volume management -->
<keybind key="XF86AudioRaiseVolume">
<action name="Execute">
<command>amixer -q -D pulse sset Master 3%+ unmute</command>
</action>
</keybind>
<keybind key="XF86AudioLowerVolume">
<action name="Execute">
<command>amixer -q -D pulse sset Master 3%- unmute</command>
</action>
</keybind>
<keybind key="XF86AudioMute">
<action name="Execute">
<command>amixer -q -D pulse sset Master toggle</command>
</action>
</keybind>
This solution was found here:
http://ubuntuforums.org/showthread.php?t=1956323
https://askubuntu.com/questions/349541/finding-volume-raise-lower-commands/
This solution, however, will not update the user's own configuration file, and
probably it shouldn't try anyway.
** Affects: lubuntu-default-settings (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1455602
Title:
Default volume keybindings do not work when audio is switched to HDMI
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