Created attachment 188750 [details] Screenshot of Display Configuration - after attempting to disable the screen, showing the error. SUMMARY On a laptop with built-in screen + external monitor connected and set to primary, System Settings - Display Configuration UI fails to disable built-in screen when unchecking "Device Enabled" and clicking on [Apply]. An error is displayed instead. STEPS TO REPRODUCE 1. Boot into Plasma Desktop on a laptop with an external screen connected and set to Primary. 2. Right click on Desktop -> Display Configuration 3. Select "Bult-in Screen" 4. Uncheck "Device: [x] Enabled" 5. Click [Apply] OBSERVED RESULT 1. Error message is displayed: "Couldn’t apply display configuration: Position of output eDP-1 is negative, that is not supported" 2. Screen disappears from the arrangement, but displays stays on. EXPECTED RESULT Screen is disabled. SOFTWARE/OS VERSIONS Operating System: Arch Linux KDE Plasma Version: 6.5.5 KDE Frameworks Version: 6.22.0 Qt Version: 6.10.1 Kernel Version: 6.18.6-arch1-1 (64-bit) Graphics Platform: Wayland Processors: 22 × Intel® Core™ Ultra 9 185H Memory: 32 GiB of RAM (31.0 GiB usable) Graphics Processor: Mesa Intel® Arc Manufacturer: LENOVO Product Name: 83D2 System Version: IdeaPad Pro 5 14IMH9
The issue only seems to occurr when the built-in screen (the one to be disabled) is positioned to the left of the primary (external) display. Thus workaround here is to rearrange the built-in screen to the right of the primary display and then disable it.
A workaround for this issue is to use the "Switch Display" keyboard shortcut, disabling the leftmost display from there works for me as well as also using that menu to place the external display to the left or right of the laptop display. In my case the laptop display is the primary display and the external display is the one on the left though, so disabling the external through System Settings is where I get the problem. Disabling the leftmost display using the terminal (with the `kscreen-doctor output.DP-1.disable` command in my case for the external display) also works, although reenabling that display using the terminal places it on top of the already enabled screen so I have to rearrange it manually that way. Operating System: Arch Linux KDE Plasma Version: 6.5.5 KDE Frameworks Version: 6.22.0 Qt Version: 6.10.1 Kernel Version: 6.18.6-arch1-1 (64-bit) Graphics Platform: Wayland Processors: 18 × Intel® Core™ Ultra 5 125H Memory: 32 GiB of RAM (30.8 GiB usable) Graphics Processor: Intel® Arc Manufacturer: Framework Product Name: Laptop 13 (Intel Core Ultra Series 1) System Version: A2
I can confirm. It used to work fine in the past, if I'm not mistaken. Only the left-most monitor is affected. Operating System: Fedora Linux 43 KDE Plasma Version: 6.5.5 KDE Frameworks Version: 6.22.0 Qt Version: 6.10.1 Kernel Version: 6.18.5-200.fc43.x86_64 (64-bit) Graphics Platform: Wayland Processors: 32 × AMD Ryzen 9 7950X3D 16-Core Processor Memory: 64 GiB of RAM (62,4 GiB usable) Graphics Processor: AMD Radeon RX 7900 XTX Manufacturer: Micro-Star International Co., Ltd. Product Name: MS-7D75 System Version: 1.0
I also confirm. My layout has 3 screens. 1 DP 1 HDMI replicated horizontal. 1 DP left align vertical. All of displays are 1920x1080. Turning on third display working, but when trying to turn it off error occurs.
KWin 6.5.5-2 on Arch appears to have fixed this issue for me, when looking into what that package version changed it appears that the difference is this commit: https://invent.kde.org/plasma/kwin/-/commit/f79af348ed9f18bc30417df4bfe539383fd9fa77