SUMMARY Changing screen brightness via qdbus or applet no longer works in SDR, only HDR mode. STEPS TO REPRODUCE 1. Decrease screen brightness by 50% via qdbus: qdbus6 org.kde.Solid.PowerManagement /org/kde/Solid/PowerManagement/Actions/BrightnessControl org.kde.Solid.PowerManagement.Actions.BrightnessControl.setBrightness $(($(qdbus6 org.kde.Solid.PowerManagement /org/kde/Solid/PowerManagement/Actions/BrightnessControl org.kde.Solid.PowerManagement.Actions.BrightnessControl.brightness) - 5000)) 2. Decrease screen brightness via Brightness and Color applet OBSERVED RESULT Screen brightness doesn't change unless I switch to HDR EXPECTED RESULT Screen brightness change regardless of color space SOFTWARE/OS VERSIONS Linux: openSUSE Tumbleweed KDE Plasma Version: 6.3.0 KDE Frameworks Version: 6.10.0 Qt Version: 6.8.2 Kernel Version: 6.12.13 GPU Driver: NVIDIA 565.77 ADDITIONAL INFORMATION This works perfectly with plasma 6.2.5. When changing brightness via the applet in 6.2.5 the logs generate this message: plasmashell[3337]: ignoring brightness change, it's coming from the applet itself. However, there aren't any messages in 6.3 even after setting export QT_LOGGING_RULES="kwin_*.debug=true"
I'm not sure if this is relevant, but kscreen-doctor reports both brightness and dimming support in Plasma 6.3, whereas only brightness support is indicated in 6.2.5
After creating a blank profile, I discovered the brightness slider only works in SDR if ICC profiles are disabled. Should I instead report this as a kwin issue?
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/7187
Git commit 59a501f7c4dde8cc6d08adda1a7843b495ea1580 by Xaver Hugl. Committed on 18/02/2025 at 16:30. Pushed by zamundaaa into branch 'master'. backends/drm: reimplement software brightness for ICC profiles When moving to reference luminance based brightness control, I forgot to port this M +4 -1 src/backends/drm/drm_output.cpp https://invent.kde.org/plasma/kwin/-/commit/59a501f7c4dde8cc6d08adda1a7843b495ea1580
Git commit 891c182903917c0ce4879787d0677630967b4491 by Xaver Hugl. Committed on 18/02/2025 at 22:52. Pushed by zamundaaa into branch 'Plasma/6.3'. backends/drm: reimplement software brightness for ICC profiles When moving to reference luminance based brightness control, I forgot to port this (cherry picked from commit 59a501f7c4dde8cc6d08adda1a7843b495ea1580) Co-authored-by: Xaver Hugl <xaver.hugl@gmail.com> M +4 -1 src/backends/drm/drm_output.cpp https://invent.kde.org/plasma/kwin/-/commit/891c182903917c0ce4879787d0677630967b4491
(In reply to Zamundaaa from comment #5) > Git commit 891c182903917c0ce4879787d0677630967b4491 by Xaver Hugl. > Committed on 18/02/2025 at 22:52. > Pushed by zamundaaa into branch 'Plasma/6.3'. > > backends/drm: reimplement software brightness for ICC profiles > > When moving to reference luminance based brightness control, I forgot to > port this > > > (cherry picked from commit 59a501f7c4dde8cc6d08adda1a7843b495ea1580) > > Co-authored-by: Xaver Hugl <xaver.hugl@gmail.com> > > M +4 -1 src/backends/drm/drm_output.cpp > > https://invent.kde.org/plasma/kwin/-/commit/ > 891c182903917c0ce4879787d0677630967b4491 I've updated to plasma 6.3.2 and still unable adjust brightness while an ICC profile is set. KDE Plasma Version: 6.3.2 KDE Frameworks Version: 6.11.0 Qt Version: 6.8.2 Kernel Version: 6.12.16 Graphics Platform: Wayland
Please try to set the brightness to 50%, and afterwards attach the output of kscreen-doctor -o and the file ~/.config/kwinoutputconfig.json
(In reply to Zamundaaa from comment #7) > Please try to set the brightness to 50%, and afterwards attach the output of > kscreen-doctor -o and the file ~/.config/kwinoutputconfig.json # kscreen-doctor -o Output: 1 HDMI-A-1 enabled connected priority 1 HDMI Modes: 1:3840x2160@60! 2:3840x2160@155 3:3840x2160@150 4:3840x2160@144 5:3840x2160@120* 6:3840x2160@60 7:3840x2160@30 8:2560x1440@160 9:1920x1080@160 10:1920x1080@120 11:1920x1080@120 12:1920x1080@60 13:1920x1080@60 14:1920x1080@50 15:1680x1050@120 16:1680x1050@60 17:1600x900@60 18:1280x1024@75 19:1280x1024@60 20:1440x900@60 21:1152x864@75 22:1280x720@60 23:1280x720@50 24:1024x768@75 25:1024x768@70 26:1024x768@60 27:800x600@75 28:800x600@72 29:800x600@60 30:720x576@50 31:720x480@60 32:640x480@75 33:640x480@73 34:640x480@60 35:640x480@60 Geometry: 0,0 1920x1080 Scale: 2 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown HDR: disabled Wide Color Gamut: disabled ICC profile: /usr/share/color/icc/default.icm Color profile source: ICC Color power preference: prefer accuracy Brightness control: supported, set to 50% and dimming to 100% Output: 2 HDMI-A-2 enabled connected priority 2 HDMI Modes: 36:3840x2160@120 37:3840x2160@60! 38:3840x2160@155* 39:3840x2160@150 40:3840x2160@144 41:3840x2160@120 42:3840x2160@60 43:3840x2160@30 44:2560x1440@160 45:1920x1080@160 46:1920x1080@120 47:1920x1080@120 48:1920x1080@60 49:1920x1080@60 50:1920x1080@50 51:1680x1050@120 52:1680x1050@60 53:1600x900@60 54:1280x1024@75 55:1280x1024@60 56:1440x900@60 57:1152x864@75 58:1280x720@60 59:1280x720@50 60:1024x768@75 61:1024x768@70 62:1024x768@60 63:800x600@75 64:800x600@72 65:800x600@60 66:720x576@50 67:720x480@60 68:640x480@75 69:640x480@73 70:640x480@60 71:640x480@60 Geometry: 1920,0 1920x1080 Scale: 2 Rotation: 1 Overscan: 0 Vrr: incapable RgbRange: unknown HDR: disabled Wide Color Gamut: disabled ICC profile: /usr/share/color/icc/default.icm Color profile source: ICC Color power preference: prefer accuracy Brightness control: supported, set to 50% and dimming to 100% # cat ~/.config/kwinoutputconfig.json [ { "data": [ { "allowSdrSoftwareBrightness": true, "autoRotation": "InTabletMode", "brightness": 0.5, "colorPowerTradeoff": "PreferAccuracy", "colorProfileSource": "ICC", "connectorName": "HDMI-A-1", "edidHash": "1aa4d0227e592a6e5f37e036e305aa8b", "edidIdentifier": "IOC 36928 100 0 1990 0", "highDynamicRange": false, "iccProfilePath": "/usr/share/color/icc/default.icm", "mode": { "height": 2160, "refreshRate": 119880, "width": 3840 }, "overscan": 0, "rgbRange": "Automatic", "scale": 2, "sdrBrightness": 100, "sdrGamutWideness": 0, "transform": "Normal", "vrrPolicy": "Never", "wideColorGamut": false }, { "allowSdrSoftwareBrightness": true, "autoRotation": "InTabletMode", "brightness": 0.5, "colorPowerTradeoff": "PreferAccuracy", "colorProfileSource": "ICC", "connectorName": "HDMI-A-2", "edidHash": "db259632d7473e1f64f07ec1f7275ccb", "edidIdentifier": "IOC 36928 200 0 1990 0", "highDynamicRange": false, "iccProfilePath": "/usr/share/color/icc/default.icm", "mode": { "height": 2160, "refreshRate": 119880, "width": 3840 }, "overscan": 0, "rgbRange": "Automatic", "scale": 2, "sdrBrightness": 100, "sdrGamutWideness": 0, "transform": "Normal", "vrrPolicy": "Never", "wideColorGamut": false }, { "allowSdrSoftwareBrightness": false, "autoRotation": "InTabletMode", "brightness": 0.34, "colorPowerTradeoff": "PreferAccuracy", "colorProfileSource": "ICC", "connectorName": "HDMI-A-1", "edidHash": "1f96e50764ce33da8b9e1ce0c27660b4", "edidIdentifier": "IOC 36928 0 3 2023 0", "highDynamicRange": true, "iccProfilePath": "/home/tofu/rtings-icc-profile.icm", "mode": { "height": 2160, "refreshRate": 119880, "width": 3840 }, "overscan": 0, "rgbRange": "Automatic", "scale": 2, "sdrBrightness": 100, "sdrGamutWideness": 0, "transform": "Normal", "vrrPolicy": "Never", "wideColorGamut": false }, { "allowSdrSoftwareBrightness": false, "autoRotation": "InTabletMode", "brightness": 0.59, "colorPowerTradeoff": "PreferAccuracy", "colorProfileSource": "ICC", "connectorName": "HDMI-A-2", "edidHash": "1f96e50764ce33da8b9e1ce0c27660b4", "edidIdentifier": "IOC 36928 0 3 2023 0", "highDynamicRange": true, "iccProfilePath": "/home/tofu/rtings-icc-profile.icm", "mode": { "height": 2160, "refreshRate": 119880, "width": 3840 }, "overscan": 0, "rgbRange": "Automatic", "scale": 2, "sdrBrightness": 100, "sdrGamutWideness": 0, "transform": "Normal", "vrrPolicy": "Never", "wideColorGamut": false } ], "name": "outputs" }, { "data": [ { "lidClosed": false, "outputs": [ { "enabled": true, "outputIndex": 0, "position": { "x": 0, "y": 0 }, "priority": 0 }, { "enabled": true, "outputIndex": 1, "position": { "x": 1920, "y": 0 }, "priority": 1 } ] }, { "lidClosed": false, "outputs": [ { "enabled": true, "outputIndex": 2, "position": { "x": 0, "y": 0 }, "priority": 0 }, { "enabled": true, "outputIndex": 3, "position": { "x": 1920, "y": 0 }, "priority": 1 } ] }, { "lidClosed": false, "outputs": [ { "enabled": true, "outputIndex": 1, "position": { "x": 0, "y": 0 }, "priority": 0 } ] }, { "lidClosed": false, "outputs": [ { "enabled": true, "outputIndex": 0, "position": { "x": 0, "y": 0 }, "priority": 0 } ] } ], "name": "setups" } ]
🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME. For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging. Thank you for helping us make KDE software even better for everyone!
Why did set it to fixed? Is the issue gone in a newer version of Plasma?