HDR colors is broken in fullscreen

Help
,
1

When using HDR in fullscreen, bright colors look very off.

Any HDR app in fullscreen seems to have wrong HDR. When pressing the “super” key to open the application menu with the taskbar, the HDR colors of the app changes to seemingly normal.

Examples:

Youtube HDR video non-fullscreen:

image
image1601×1201 786 KB

Youtube HDR video fullscreen:

image
image1601×1201 759 KB

Death Stranding 2 (proton-cachyos) non-fullscreen:

image
image1597×1201 437 KB

Death Stranding 2 fullscreen:

image
image1597×1201 431 KB

mpv (cmd: mpv --vo=gpu-next --gpu-api=vulkan --gpu-context=waylandvk) non-fullscreen:

image
image1597×1201 578 KB

mpv fullscreen:

image
image1597×1201 589 KB

My monitor is a AW3423DWF.

GPU: AW3423DWF

Using plasma-desktop 6.6.3, linux 6.19.9, mesa 26.0.3

kscreen-doctor output

$ kscreen-doctor -o
Output: 1 DP-2 cace3285-c3eb-4a8b-9e46-d78e42098e08
        enabled
        connected
        priority 1
        DisplayPort
        replication source:0
        Modes:  1:3440x1440@59.97!  2:3440x1440@164.90*  3:3440x1440@99.98  4:2560x1440@143.97  5:2560x1440@120.00  6:2560x1440@59.95  7:1920x1080@143.85  8:1920x1080@120.00  9:1920x1080@119.88  10:1920x1080@60.00  11:1920x1080@60.00  12:1920x1080@59.94  13:1920x1080@50.00  14:1920x1080@30.00  15:1920x1080@29.97  16:1920x1080@25.00  17:1920x1080@24.00  18:1920x1080@23.98  19:1600x900@60.00  20:1280x1024@75.03  21:1280x1024@60.02  22:1152x864@75.00  23:1280x720@60.00  24:1280x720@59.94  25:1280x720@50.00  26:1024x768@75.03  27:1024x768@60.00  28:800x600@75.00  29:800x600@60.32  30:720x576@50.00  31:720x480@60.00  32:720x480@60.00  33:720x480@59.94  34:720x480@59.94  35:640x480@75.00  36:640x480@60.00  37:640x480@59.94  38:640x480@59.94  39:720x400@70.08  40:1600x1200@59.87  41:1600x1200@164.84  42:1280x1024@164.81  43:1024x768@164.78  44:1920x1200@59.88  45:1920x1200@164.85  46:1280x800@59.81  47:1280x800@164.65  48:2560x1440@164.87  49:1920x1080@164.76  50:1600x900@164.66  51:1368x768@59.88  52:1368x768@164.82  53:1280x720@164.71
        Custom modes: None
        Geometry: 0,0 3440x1440
        Scale: 1
        Rotation: 1
        Overscan: 0
        Vrr: Automatic
        RgbRange: Automatic
        HDR: enabled
                SDR brightness: 240 nits
                SDR gamut wideness: 0%
                Peak brightness: 456 nits, overridden with: 450 nits
                Max average brightness: 265 nits
                Min brightness: 0.0003 nits
        Wide Color Gamut: enabled
        ICC profile: none
        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: automatic (10), range: [8; 16] bits per color
        Allow EDR: unsupported
        Sharpness control: unsupported
        Automatic brightness: unsupported

Any help is much appreciated!

2

Same monitor and same problem here.

You might be running into this: https://bugs.kde.org/show_bug.cgi?id=517793

Switching to “Prefer color accuracy” does indeed fix HDR in fullscreen in Death Stranding 2.

1 Like