https://bugs.kde.org/show_bug.cgi?id=484899
Bug ID: 484899
Summary: Dual Monitor HDR causes at least one screen to be
washed out (HDR over SDR output)
Classification: Plasma
Product: kwin
Version: 6.0.3
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: kde@sbox.click
Target Milestone: ---
Created attachment 168042
--> https://bugs.kde.org/attachment.cgi?id=168042&action=edit
Monitor input information with both displays set to HDR enabled
STEPS TO REPRODUCE
1. Connect two HDR monitors (in my case over two DP1.4a -> HDMI 2.1 Adapters,
due to amdgpu limitations)
2. Enable HDR on both
OBSERVED RESULT
At least one output will have washed out colors, the same way an HDR video
looks when you play it on an SDR screen without tone mapping.
Sometimes I also got a pure black screen.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: EndeavourOS
KDE Plasma Version: 6.0.3
In the attached image, VRR only switches to FREESYNC PREMIUM, once it gets an
HDR signal.
kscreen-doctor -o
Output: 1 DP-1
enabled
connected
priority 1
DisplayPort
Modes: 0:3840x2160@60! 1:4096x2160@120 2:4096x2160@120
3:4096x2160@100 4:4096x2160@60 5:4096x2160@60 6:4096x2160@50 7:4096x2160@30
8:4096x2160@30 9:4096x2160@25 10:4096x2160@24 11:4096x2160@24
12:3840x2160@120* 13:3840x2160@120 14:3840x2160@100 15:3840x2160@96
16:3840x2160@72 17:3840x2160@60 18:3840x2160@60 19:3840x2160@60
20:3840x2160@50 21:3840x2160@50 22:3840x2160@48 23:3840x2160@30
24:3840x2160@30 25:3840x2160@25 26:3840x2160@24 27:3840x2160@24
28:2560x1440@120 29:1920x1200@60 30:1920x1080@120 31:1920x1080@120
32:1920x1080@100 33:1920x1080@60 34:1920x1080@60 35:1920x1080@60
36:1920x1080@50 37:1920x1080@30 38:1920x1080@30 39:1920x1080@25
40:1920x1080@24 41:1920x1080@24 42:1600x1200@60 43:1680x1050@60
44:1280x1024@60 45:1440x900@60 46:1280x800@60 47:1152x864@60 48:1280x720@60
49:1280x720@60 50:1280x720@50 51:1024x768@60 52:800x600@60 53:720x576@50
54:720x480@60 55:720x480@60 56:720x480@60 57:720x480@60 58:640x480@60
59:640x480@60 60:720x400@70 61:1600x1200@60 62:1280x1024@60 63:1024x768@60
64:2560x1600@60 65:1920x1200@60 66:1280x800@60 67:3840x2160@60
68:3200x1800@60 69:2880x1620@60 70:2560x1440@60 71:1920x1080@60
72:1600x900@60 73:1368x768@60 74:1280x720@60
Geometry: 2560,0 2560x1440
Scale: 1.5
Rotation: 1
Overscan: 0
Vrr: Automatic
RgbRange: unknown
HDR: enabled
SDR brightness: 160 nits
SDR gamut wideness: 0%
Peak brightness: 800 nits, overridden with: 800 nits
Max average brightness: 0 nits
Min brightness: 0 nits
Wide Color Gamut: enabled
ICC profile: none
Output: 2 DP-2
enabled
connected
priority 2
DisplayPort
Modes: 0:3840x2160@60! 1:4096x2160@120 2:4096x2160@120
3:4096x2160@100 4:4096x2160@60 5:4096x2160@60 6:4096x2160@50 7:4096x2160@30
8:4096x2160@30 9:4096x2160@25 10:4096x2160@24 11:4096x2160@24
12:3840x2160@120* 13:3840x2160@120 14:3840x2160@100 15:3840x2160@96
16:3840x2160@72 17:3840x2160@60 18:3840x2160@60 19:3840x2160@60
20:3840x2160@50 21:3840x2160@50 22:3840x2160@48 23:3840x2160@30
24:3840x2160@30 25:3840x2160@25 26:3840x2160@24 27:3840x2160@24
28:2560x1440@120 29:1920x1200@60 30:1920x1080@120 31:1920x1080@120
32:1920x1080@100 33:1920x1080@60 34:1920x1080@60 35:1920x1080@60
36:1920x1080@50 37:1920x1080@30 38:1920x1080@30 39:1920x1080@25
40:1920x1080@24 41:1920x1080@24 42:1600x1200@60 43:1680x1050@60
44:1280x1024@60 45:1440x900@60 46:1280x800@60 47:1152x864@60 48:1280x720@60
49:1280x720@60 50:1280x720@50 51:1024x768@60 52:800x600@60 53:720x576@50
54:720x480@60 55:720x480@60 56:720x480@60 57:720x480@60 58:640x480@60
59:640x480@60 60:720x400@70 61:1600x1200@60 62:1280x1024@60 63:1024x768@60
64:2560x1600@60 65:1920x1200@60 66:1280x800@60 67:3840x2160@60
68:3200x1800@60 69:2880x1620@60 70:2560x1440@60 71:1920x1080@60
72:1600x900@60 73:1368x768@60 74:1280x720@60
Geometry: 0,0 2560x1440
Scale: 1.5
Rotation: 1
Overscan: 0
Vrr: Automatic
RgbRange: unknown
HDR: enabled
SDR brightness: 160 nits
SDR gamut wideness: 0%
Peak brightness: 800 nits, overridden with: 800 nits
Max average brightness: 0 nits
Min brightness: 0 nits
Wide Color Gamut: enabled
ICC profile: none
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