[Bug 56866] Change of the brightness via "SetGammaRamp" function also changes the brightness globally (under X11)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=56866

--- Comment #2 from C. Leu  ---
Yes, indeed I can confirm that this topic is not Mesa driver related.

The "SetGammaRamp" function is changing the brightness under X11 globally most
likely on any Mesa driver.

However, when Xwayland is used then a change to the brightness shows no effect.
This is true also for the r600 Mesa driver. More information about that issue
can be found in Xserver-bug report 1117:

https://gitlab.freedesktop.org/xorg/xserver/-/issues/1117