Hi

I've managed to set the gamma value, though not the way it should be done.

A solution is to make an /etc/X11/xorg.conf with "Gamma ..." in the monitor 
section:

----snip----
Section "InputDevice"
        Identifier      "Generic Keyboard"
        Driver          "kbd"
        Option          "XkbRules"      "xorg"
        Option          "XkbModel"      "pc105"
        Option          "XkbLayout"     "de"
        Option          "XkbVariant"    "nodeadkeys"
EndSection

Section "InputDevice"
        Identifier      "Configured Mouse"
        Driver          "mouse"
EndSection

Section "Device"
        Identifier      "Configured Video Device"
EndSection

Section "Monitor"
        Identifier      "Configured Monitor"
        Gamma 1.75
EndSection

Section "Screen"
        Identifier      "Default Screen"
        Monitor         "Configured Monitor"
EndSection
----snip----

It works, although the value should be set with a KDE/Trinity configuration 
option instead. I'm sure I had set the gamma value in KDE configuration, most 
probably in "display". But now, it has disappeared.

Seems my installation is screwed. I've tried reinstalling KDE4, but the gamma 
configuration option didn't appear.


Bye,
Volker