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Hi,

r_gamma has no effect in 4.2 when using the mesa open source drivers. This happens both on mesa 8.0.4 (latest stable drivers) and mesa from git master. The actual driver is r600g -- that is, the Radeon HD driver -- but r_gamma is also unusable with software rendering. It *could* be a driver bug; please let me know if you think it is, I'll open a bug report in the appropriate bugzilla.

Since gamma tweaking is fundamental for decent gameplay (I have a hard time spotting blue players in eagle and reds in casa otherwise), I'd love if it was fixed in one of the next updates. And no, I can't change the overall display brightness on this laptop.

Same issue in 4.1.1 and earlier, but it still affects the new release so I guess I'd do people a favor to report it.

Cheers.

[CMM|Rylius]

Since I suppose you're running Linux: You can't change r_gamma in windowed mode. Switching to fullscreen *should* fix it. Otherwise, you can wrap the executable in a script that increases system gamma. Something like this:

xgamma -gamma 2
./Quake3-UrT.i386
xgamma -gamma 1

AMD drivers are generally crap, so don't be surprised if nothing of that works. :)

[bw|lebbra]

I "solved" the problem simply switching out and in again from UrT, using ALT+TAB

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Rylius, on 08 August 2012 - 11:49 PM, said:

Since I suppose you're running Linux: You can't change r_gamma in windowed mode. Switching to fullscreen *should* fix it. Otherwise, you can wrap the executable in a script that increases system gamma. Something like this:

xgamma -gamma 2
./Quake3-UrT.i386
xgamma -gamma 1

AMD drivers are generally crap, so don't be surprised if nothing of that works. :)

Nice workaround, I'll stick to it till the bug is fixed. Thanks :-)