I'm sure most of you have a custom r_gamma > 1.0.
It has an unfortunate side effect that all windows are overbrightened and bleached when you alt-tab from TDM.
For that reason I myself have for a long time stopped using r_gamma.
However sometimes a map is so dark that I wonder if the author was designating it to be played with high gamma value (e.g. Old Habits 1).
I'm going to put a new uniform to the ambient interaction shader that would brighten up ambient lights using r_gamma cvar value. At the same time I will disable device gamma ramp in regards of gamma. "Normal" point lights will ignore r_gamma from now on, as well as GUI's, etc.
This will affect the svn version, not 2.06.
Another problem this should reduce is color banding. Gamma ramp makes banding more visible due to relatively higher steps between dim color shades.