Making the audio keys and brightness keys working in LXDE
The audio keys or multimedia keys are simple to add. Add the following keybindings to your file
<keybind key="XF86AudioRaiseVolume"> <action name="Execute"> <command>amixer set Master 5%+ unmute</command> </action> </keybind> <keybind key="XF86AudioLowerVolume"> <action name="Execute"> <command>amixer set Master 5%- unmute</command> </action> </keybind> <keybind key="XF86AudioMute"> <action name="Execute"> <command>amixer set Master toggle</command> </action> </keybind>
As you can see, it uses the key ids XF86AudioRaiseVolume, XF86AudioLowerVolume and XF86AudioMute.
It uses the comman
amixer to actually change the volume etc.
Credits go to: Create LXDE Fn Key Shortcut for Brightness & Volume on Archlinux .
I’m using an Apple MacBook Pro - and this means, the brightness is controlled through the kernel driver
apple-gmux. You can simply change the brightness by writing to special files under the
In order to make it simpler to add the key binding, the following shell script can be used:
#!/bin/sh if [ ! -e /sys/class/backlight/gmux_backlight ]; then modprobe apple-gmux fi STEP=5000 BL_FILE=/sys/class/backlight/gmux_backlight/brightness VALUE=$(cat $BL_FILE) MAX=$(cat /sys/class/backlight/gmux_backlight/max_brightness) echo "Current: $VALUE" echo "Max: $MAX" NEW=$VALUE if [ "$1" = "-" ]; then NEW=$(echo $VALUE - $STEP | bc) elif [ "$1" = "+" ]; then NEW=$(echo $VALUE + $STEP | bc) fi if [ $NEW -gt $MAX ]; then NEW=$MAX elif [ $NEW -lt 0 ]; then NEW=0 fi echo "New: $NEW" echo $NEW > $BL_FILE
It first loads the kernel module “apple-gmux” if necessary, reads out the current value and the maximum value.
In case the first argument is a “+” it calculates the new value using
Please note, that this script needs to be run as root, so you probably want to set it up via
e.g. the following rule:
myuser ALL=(ALL:ALL) NOPASSWD: /home/myuser/backlight
And the final bit is the keybindings for XF86MonBrightnessUp and XF86MonBrightnessDown
<keybind key="XF86MonBrightnessUp"> <action name="Execute"> <command>sudo /home/myuser/backlight +</command> </action> </keybind> <keybind key="XF86MonBrightnessDown"> <action name="Execute"> <command>sudo /home/myuser/backlight -</command> </action> </keybind>
Reload openbox configuration
openbox-lxde --reconfigure in order to reload the new keybindings and use them immediately.
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