Re: Legacy gamma table updates broken in 4.7-rc4

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On Wed, Jul 06, 2016 at 12:26:44PM +0200, Mario Kleiner wrote:
> 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?

Not sure what's going on, but might need a reverse bisect to cherry-pick
the fixes over. It's indeed supposed to keep working. Lionel has been
working on this, adding him.
-Daniel

> 
> Thanks,
> -mario
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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