A strange one. In Linux 4.7-rc4, at least as build by the Ubuntu
mainline ppa, gamma table updates via RandR don't work. No errors are
reported and the X-Server thinks everything went well, but on Intel
Ironlake and Ivybridge the updates don't have any visual effect.
The same problem doesn't happen with current drm-next, so something was
fixed. Looking at the new code in intel_color.c i can't see anything
obvious that would break it on 4.7-rc but make it work on drm-next?
Are there some gamma fixes in drm-next that didn't make it into 4.7-rc yet?
Thanks,
-mario
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