No change when trying to change gamma lavel

[Oblidor]

It seems as though the ATI drivers do not support gamma changes via the SDL_SetGamma call, which performs an XF86VidModeSetGamma in X11.

I see the same issue on my ATI HD 3000 card as well, but not on my Nvidia 7300.

Yes, seems gamma changes are not possible in game. I solved the problem by a small script:
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#!/bin/sh

xgamma -gamma 0.7
./Amnesia.bin64
xgamma -gamma 1.0
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(from memory)

Running this starts amnesia with the gamma level that works best for me. This also solved the ugly shadow effects I got due to that the gamma was too high.