Gamma problem after 4096 LUT entries change

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On 2018-04-15 05:37 AM, Môshe van der Sterre wrote:
> Hello Leo Li,
> 
> The current mainline has a gamma regression for me, running wayland on a Ryzen 5 2400G (integrated gpu). Colors are much too dark after the following commit:
> 086247a4b2fb "drm/amd/display: Use 4096 lut entries"
> 
> From this commit alone I cannot deduce how to properly address the problem. Reverting restores the correct colors. Unfortunately, I have no other amdgpu hardware to test if this is specific to the integrated gpu or not.
> 
> I'll gladly test possible fixes or debug a little further if you can point me in the right direction.
> 

Can you give attached patch a spin. We'll probably merge it or a variant of it soon.

Harry

> Thanks,
> Môshe van der Sterre
> 
> 
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