Frictional Games Forum (read-only)

Hi

I have tried to change the gamma level to make the grey box almost not visible. But when I change the gamma value I see no change whatsoever. This applies to Amnesia and all the Penumbria games.

I'm using the fglrx driver for Ati HD 4870 in Xorg (Ubuntu 10.04 64-bit). I also run xcalib at boot to calibrate the screen and this works. Does the xcalib prevent the the gamma change in the game? Anybody experiencing the same problems? I don't know if it is driver problem, setup problem or the games have some problems.

Any hints much appreciated.

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.

(09-13-2010, 02:40 PM)Urkle Wrote: [ -> ]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:
------
#!/bin/sh

xgamma -gamma 0.7
./Amnesia.bin64
xgamma -gamma 1.0
----

(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.