[kwin] [Bug 524067] HDR regression in KWin 6.6.6 on AMD/RADV: Cyberpunk 2077 HDR perfect on 6.6.4, washed out on 6.6.6

https://bugs.kde.org/show_bug.cgi?id=524067

--- Comment #1 from Strammer <[email protected]> ---
Clarification about the HDR configuration

HDR in Cyberpunk 2077 requires the following Steam launch configuration on my
system:

VK_LOADER_DEBUG=warn PROTON_LOG=1 DXVK_LOG_LEVEL=info PROTON_ENABLE_WAYLAND=1
PROTON_ENABLE_HDR=1 PROTON_FORCE_NVAPI=1 DXVK_NVAPI_ALLOW_OTHER_DRIVERS=1
DXVK_CONFIG="dxgi.customVendorId = 10de" %command% --launcher-skip -dx12

The important regression test is therefore not "KWin 6.6.4 works with
completely default settings".

Rather:

    With KWin 6.6.4 + the above launch configuration, Cyberpunk 2077 HDR
renders correctly.

    With KWin 6.6.6 + the exact same launch configuration, HDR becomes severely
washed out/smeared.

    Downgrading only kwin-wayland, kwin-common and kwin-data from 6.6.6 to
6.6.4 restores the correct HDR rendering.

    Mesa/RADV, Wine, Cyberpunk, GPU, display and the Steam launch configuration
were kept unchanged during the comparison.

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