Comment # 7
on bug 110677
from Nicholas Kazlauskas
The issue is in the display driver. The driver does an sRGB degamma, CTM, then sRGB regamma + user regamma - which explains why the screen is mostly white (since the curve is inverse). If the the degamma block was put into linear bypass and the user regamma was applied directly to the regamma block that should give the correct result. Not sure if mapping the legacy gamma to the full LUT would break any IGT color or standard X11 gamma operations. I do have some changes that fix this kind of operation for atomic userspace but I'd have to take a look at the legacy one again to know if this is easy to support or not.
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