Created attachment 175846 [details] edid-decode output SUMMARY Starting with Plasma 6.2.1, I've noticed raised blacks when HDR is enabled. I tested as high as KDE 6.2.3. I use OpenSUSE Tumbleweed. For now, I've added a lock to kwin6 in zypper to stick with version 6.2.0-1.1. Note that I first noticed this issue in ArchLinux, so it is not distro-specific. STEPS TO REPRODUCE 1. Enable HDR 2. Display anything that should be solid black (for instance, solid black desktop background) OBSERVED RESULT Blacks are slightly raised on an OLED monitor. EXPECTED RESULT Pixels should be off altogether. SOFTWARE/OS VERSIONS Kernel: 6.11.7-1.1 Kwin: 6.2.1+ ADDITIONAL INFORMATION See attached EDID
The only relevant commit in 6.2.1 vs 6.2.0 is the one that fixed bug 494128, so this is most likely caused by the minimum luminance being changed. First, please attach the output of > kscreen-doctor -o while HDR is enabled. Afterwards, see if overriding the minimum luminance of your screen to be zero resolves the issue, like this: > kscreen-doctor output.1.minBrightnessOverride.0
Hello, Here's the output of kscreen-doctor : > Output: 1 DP-3 > enabled > connected > priority 1 > DisplayPort > Modes: 1:3840x2160@60! 2:3840x2160@240* 3:3840x2160@180 4:3840x2160@120 5:2560x1440@240 6:2560x1440@120 7:2560x1440@60 8:1920x1200@60 9:1920x1080@240 10:1920x1080@120 11:1920x1080@120 12:1920x1080@120 13:1920x1080@60 14:1920x1080@60 15:1920x1080@60 16:1600x1200@60 17:1680x1050@60 18:1280x1024@75 19:1280x1024@60 20:1440x900@60 21:1280x800@60 22:1280x720@120 23:1280x720@120 24:1280x720@60 25:1280x720@60 26:1024x768@75 27:1024x768@70 28:1024x768@60 29:800x600@75 30:800x600@72 31:800x600@60 32:800x600@56 33:720x576@60 34:720x576@50 35:720x480@60 36:720x480@60 37:640x480@75 38:640x480@73 39:640x480@67 40:640x480@60 41:640x480@60 42:1600x1200@60 43:1280x1024@60 44:1024x768@60 45:2560x1600@60 46:1920x1200@60 47:1280x800@60 48:3840x2160@60 49:3200x1800@60 50:2880x1620@60 51:2560x1440@60 52:1920x1080@60 53:1600x900@60 54:1368x768@60 55:1280x720@60 > Geometry: 0,0 3840x2160 > Scale: 1 > Rotation: 1 > Overscan: 0 > Vrr: Never > RgbRange: unknown > HDR: enabled > SDR brightness: 150 nits > SDR gamut wideness: 0% > Peak brightness: 1037 nits > Max average brightness: 456 nits > Min brightness: 0.0006 nits > Wide Color Gamut: enabled > ICC profile: none > Color profile source: sRGB > Brightness control: supported, set to 100% And here's the output after overriding the minimum luminance (which does indeed solve the issue) : > Output: 1 DP-3 > enabled > connected > priority 1 > DisplayPort > Modes: 1:3840x2160@60! 2:3840x2160@240* 3:3840x2160@180 4:3840x2160@120 5:2560x1440@240 6:2560x1440@120 7:2560x1440@60 8:1920x1200@60 9:1920x1080@240 10:1920x1080@120 11:1920x1080@120 12:1920x1080@120 13:1920x1080@60 14:1920x1080@60 15:1920x1080@60 16:1600x1200@60 17:1680x1050@60 18:1280x1024@75 19:1280x1024@60 20:1440x900@60 21:1280x800@60 22:1280x720@120 23:1280x720@120 24:1280x720@60 25:1280x720@60 26:1024x768@75 27:1024x768@70 28:1024x768@60 29:800x600@75 30:800x600@72 31:800x600@60 32:800x600@56 33:720x576@60 34:720x576@50 35:720x480@60 36:720x480@60 37:640x480@75 38:640x480@73 39:640x480@67 40:640x480@60 41:640x480@60 42:1600x1200@60 43:1280x1024@60 44:1024x768@60 45:2560x1600@60 46:1920x1200@60 47:1280x800@60 48:3840x2160@60 49:3200x1800@60 50:2880x1620@60 51:2560x1440@60 52:1920x1080@60 53:1600x900@60 54:1368x768@60 55:1280x720@60 > Geometry: 0,0 3840x2160 > Scale: 1 > Rotation: 1 > Overscan: 0 > Vrr: Never > RgbRange: unknown > HDR: enabled > SDR brightness: 150 nits > SDR gamut wideness: 0% > Peak brightness: 1037 nits > Max average brightness: 456 nits > Min brightness: 0 nits, overridden with: 0 nits > Wide Color Gamut: enabled > ICC profile: none > Color profile source: sRGB > Brightness control: supported, set to 100%
Okay. Is > kscreen-doctor output.1.minBrightnessOverride.50 also sufficient to deal with this?
(In reply to Zamundaaa from comment #3) > Okay. Is > > kscreen-doctor output.1.minBrightnessOverride.50 > also sufficient to deal with this? Hello. Sorry for the delay. Yes, it does fix the issue. FYI, I tried several values to see at which point it happens, and the issue occurs when the value is 106 or more.
This is very confusing. Just to be sure, if you disable the override again (kscreen-doctor output.1.minBrightnessOverride.disable), it also re-appears?
(In reply to Zamundaaa from comment #5) > This is very confusing. Just to be sure, if you disable the override again > (kscreen-doctor output.1.minBrightnessOverride.disable), it also re-appears? Weirdly enough, no. Even weirder, I set the brightness to 106 to force the bug. I then disabled the minBrightnessOverride, and it... fixes the issue. Honestly, I'm just confused at this point, because I got this issue on version 6.2.3, I said as much in the original ticket, but it's just gone. It's like I was in some weird state upon updating to latest kwin, and now it's just gone with the minBrightnessOverride fix. FYI, I'm currently on kwin at version 6.2.3-1.1.
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I'm not sure what's going on here either. Let's just close the bug report, and if it happens again, reopen it