WORD desktop_gammaramp[3][256]; // jitgamma
qboolean gammaramp_supported;

void printgammaramp  () // for debugging
{
	FILE *blah;
	int i;

	blah = fopen("C:/gammaramp.txt","w");
	for(i=0;i<256;i++)
		fprintf(blah,"%d %d %d\n", desktop_gammaramp[0], desktop_gammaramp[1], desktop_gammaramp[2]);
}

void VID_BackupGamma() // jitgamma
{
	HDC	hdc;

	hdc = GetDC (GetDesktopWindow());
	gammaramp_supported = GetDeviceGammaRamp (hdc, &desktop_gammaramp[0][0]);
printgammaramp();
	ReleaseDC (GetDesktopWindow(), hdc);
}

void VID_RestoreGamma() // jitgamma
{
	if(gammaramp_supported)
	{
		HDC	hdc;

		hdc = GetDC (GetDesktopWindow());
		SetDeviceGammaRamp (hdc, &desktop_gammaramp[0][0]);
		ReleaseDC (GetDesktopWindow(), hdc);
	}
}
 </pre> 

I''ll go into the driver settings and crank the red channel way up, for example, then run quake2, and when I quit, the gamma ramp goes back to the default settings (red isn''t bright).

Here''s what gammaramp.txt <i>always</i> looks like:
0 0 0
256 256 256
512 512 512
768 768 768
1024 1024 1024
…
64768 64768 64768
65024 65024 65024
65280 65280 65280

Any ideas?  </i>