The modesetting driver is missing gamma support Steps to reproduce: 1. With modesetting driver installed, Launch any SDL game such as OpenArena or Urban Terror 2. Adjust gamma settings Expected Results: Game world is visible Actual Results: Gamma levels do not change leaving all games too dark to play In my testing, Nvidia proprietary, xf86-video-intel, xf86-video-ati, and xf86-video-nouveau all support gamma controls. Only modesetting seems to lack this essental feature for playing SDL based games.
Fixed with https://cgit.freedesktop.org/xorg/xserver/commit/?id=ac138f9b31b0fba00742edbc3326afe66e28099a
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