Back to using XFCE. My experience with KDE was a nice run, but I miss the simplicity of GTK :) Anyway, it seems that the XFCE panel brightness plugin does not remember the settings after log off. I boot to runlevel 3 and therefore I put the following in
#!/bin/sh # xinitrc.xfce - modified to work around xfce4session bug # https://bugzilla.xfce.org/show_bug.cgi?id=8841 xgamma -gamma 0.4 xbacklight -set 70
Now gamma is set to 40% and backlight to 70%. I just like dark.