[Mesa-dev] [Bug 89452] [Regression] Gamma controls broken on all SDL/Quake based games

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89452

            Bug ID: 89452
           Summary: [Regression] Gamma controls broken on all SDL/Quake
                    based games
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mesa core
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: lukebenes at hotmail.com
        QA Contact: mesa-dev at lists.freedesktop.org

The gamma controls no longer work on (io)Quake based games with Mesa drivers.
This regression occurred in 7.4 commit:

http://cgit.freedesktop.org/xorg/xserver/commit/?id=91f73b79b7ae64e5b846d1efeb470bb61a913720

Maarten says it "should be driver ABI compatible", but it breaks Mesa's own
drivers. I have observed this broken behavior with the Mesa software renderer,
a Geforce 650 with Mesa 10.5 and 10.6, and ATI X1800 with Mesa 10.5 and 10.6.
Ironically, the proprietary drivers have hacked around this bug, so they're not
affected. Nouveau's default gamma is so dark that OpenArena is unplayable with
my GTX 650. 

A sample of downstream bug reports from game engines/frameworks affected:
http://openarena.ws/board/index.php?topic=3699.0
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=645299
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=565638
https://bugzilla.libsdl.org/show_bug.cgi?id=971
https://bbs.archlinux.org/viewtopic.php?id=84040

It should be possible for a game to control it's own gamma and not force the
user to change system-wide settings every time they want to play. How can we
fix this issue? Implement the same work-around as the proprietary drivers or
revert/fix the commit that's causing this problem?

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