https://bugs.kde.org/show_bug.cgi?id=510216

            Bug ID: 510216
           Summary: HDR broken in Proton games
    Classification: Plasma
           Product: kwin
      Version First git master
       Reported In:
          Platform: Compiled Sources
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: platform-drm
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]
  Target Milestone: ---

SUMMARY
Recently, I've noticed that when enabling HDR in games where it used to work,
the colour pallette turns more grey-ish, compared increasing the range of
colours and brightness. (I think some HDR videos might also be broken, testing
with Youtube via Firefox Wayland and MPV's HDR settings, but I'm not sure what
it to look for, so I won't really use those as a benchmark here...)

I am using Proton-EM, which has a bunch of patches enabling use of Wayland and
HDR.

My benchmark has been Hollow Knight: Silksong using RenoDX via Reshade to make
HDR happen, which I recall used to work.

STEPS TO REPRODUCE
1. Have HDR monitor
2. Upgrade to latest KWin Git master via kde-build / kde-builder 
3. Test games with HDR via Proton-EM 2E / 2F (2E I know used to work not too
long ago, but 2F is more recent)

OBSERVED RESULT
Colours become more washed-out / greyish when HDR is enabled

EXPECTED RESULT
Colours in HDR-enabled games should be more vibrant, instead of washed out

SOFTWARE/OS VERSIONS
Operating System: CachyOS Linux 
KDE Plasma Version: 6.5.80
KDE Frameworks Version: 6.19.0
Qt Version: 6.9.2
Kernel Version: 6.17.0-2-cachyos-bore (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 7800X3D 8-Core Processor
Memory: 32 GiB of RAM (30.2 GiB usable)
Graphics Processor 1: AMD Radeon RX 7900 XTX
Graphics Processor 2: AMD Radeon Graphics
Manufacturer: ASRock
Product Name: X670E Pro RS

ADDITIONAL INFORMATION
kscreen-doctor -o output:

Output: 1 DP-1 a0cedf15-7979-4469-8256-208a92eea4c8
        enabled
        connected
        priority 1
        DisplayPort
        replication source:0
        Modes:  1:[email protected]!  2:[email protected]  3:[email protected] 
4:[email protected]  5:[email protected]  6:[email protected]*  7:[email protected]
 8:[email protected]  9:[email protected]  10:[email protected]  11:[email protected]
 12:[email protected]  13:[email protected]  14:[email protected] 
15:[email protected]  16:[email protected]  17:[email protected]  18:[email protected]
 19:[email protected]  20:[email protected]  21:[email protected]  22:[email protected] 
23:[email protected]  24:[email protected]  25:[email protected]  26:[email protected] 
27:[email protected]  28:[email protected]  29:[email protected]  30:[email protected] 
31:[email protected]  32:[email protected]  33:[email protected]  34:[email protected] 
35:[email protected]  36:[email protected]  37:[email protected]  38:[email protected] 
39:[email protected]  40:[email protected]  41:[email protected]  42:[email protected] 
43:[email protected]  44:[email protected]  45:[email protected]  46:[email protected] 
47:[email protected]  48:[email protected]  49:[email protected]  50:[email protected] 
51:[email protected]  52:[email protected]  53:[email protected]  54:[email protected] 
55:[email protected]  56:[email protected]  57:[email protected]  58:[email protected] 
59:[email protected]  60:[email protected]  61:[email protected]  62:[email protected] 
63:[email protected]  64:[email protected]  65:[email protected]
        Geometry: 0,0 2560x1440
        Scale: 1
        Rotation: 1
        Overscan: 0
        Vrr: Never
        RgbRange: Full
        HDR: enabled
                SDR brightness: 520 nits
                SDR gamut wideness: 100%
                Peak brightness: 1156 nits, overridden with: 1156 nits
                Max average brightness: 1156 nits
                Min brightness: 0.0514 nits
        Wide Color Gamut: enabled
        ICC profile:
/run/media/valmar/IronWolfRAID1/Random/drivers/ae6d7f97-1302-4f2e-9430-6d6db4e7cbae/Q27G3XMN.icm
        Color profile source: EDID
        Color power preference: prefer efficiency and performance
        Brightness control: supported, set to 100% and dimming to 100%
        DDC/CI: allowed
        Color resolution: 10 bits per color, range: [8; 16] bits per color
        Allow EDR: unsupported
        Sharpness control: unsupported

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