For months (years?) I have wondered why my ThinkPads fail to turn the backlight off when the screen is locked (blanked).
Solution: xset dpms force off in a Script
Unforunately, I found no way to get the X system to turn the backlight off.
The only way to turn it of is to use xset to switch the screen off.
An according lock script might look like this:
The script solution above has one disadvantage: The script needs to be called. Time based screen locking and Xfce's "lock screen" button won'nt use it.
Fortunately, Xfce4 uses a script anyway, in the first place:
One can simple edit this file (as root), and insert the
xset call right before the final
Of course this edit has to be re-done after an upgrade that provides a fresh original version of