Gamma problem after 4096 LUT entries change

[Môshe van der Sterre]

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.

Thanks,
Môshe van der Sterre


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