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Merged
Created Dec 05, 2018 by Michel Dänzer@daenzerMaintainer

xfree86/modes: Don't clobber gamma LUT of compatibility output's CRTC

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If the driver calls xf86HandleColormaps, CMapChangeGamma updates the HW gamma LUT of all CRTCs via xf86RandR12LoadPalette. However, xf86RandR12ChangeGamma was then clobbering the gamma LUT of the RandR 1.2 compatibility output's CRTC with the gamma curves computed from the screen's global gamma values.

Fix this by bailing if xf86RandR12LoadPalette is installed.

Fixes: 02ff0a5d "xf86RandR12: Fix XF86VidModeSetGamma triggering a BadImplementation error"

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Source branch: xf86RandR12ChangeGamma-bail