Screen Brightness controls
The sven keyboard daemon, which is in the system tray,
calls a couple scripts to control the screen brightness.
Unfortunately this varies a bit between computers. There's a
couple things that can go wrong with this.
1) Sven isn't configured to use the correct keys for your
2) The two scripts that Sven calls
(/usr/bin/brightness-up and /usr/bin/brightness-down) could be
using the wrong file in /sys
So the first thing to do is open a terminal and type: brightness-up
and then press Enter.
If it changes the screen brightness then it's probably problem 1,
and you need to right-click on the sven tray icon and select
Preferences. If you get an error about file not found , then it's
probably problem 2.
The brightness-up script looks like this:
DEVICE= #radeon_bl0, acpi_video0, etc
[ -z $DEVICE ] && DEVICE=$(ls $DEVPATH | head -n 1)
[ -z $DEVICE ] && exit 1
CURRENT=$(( CURRENT + STEP ))
if [ "$CURRENT" -gt "$MAX" ]; then CURRENT=$MAX; fi
echo $CURRENT > $DEVPATH/$DEVICE/brightness
For problem 2, you'll need to replace
/sys/class/backlight/acpi_video0/ with the correct path. You'll
also need to make the corresponding changes to