SUMMARY Some scenario leads to a situation when trying to login to Wayland session the PC just freezes after SDDM with black screen and white _ in the upper left corner of the screen. STEPS TO REPRODUCE I am not sure how to reproduce it. I am sure it has something to do with playing with the Display Settings where we can set the refresh rate, adaptive synchronization, color profile etc. I had this situation twice already. I was playing with the display setting to test poor performance on the Nvidia GPU. I was changing the refresh rate, adaptive synchronization, once set build in color profile. There were no crashes when playing with tho settings, just PC freeze after reboot and login with SDDM. There is one workaround/manual fix which allows me to restore my desktop and use Wayland session: - enter recovery mode or CLI when not in any active session - remove file: ~/.config/kwinoutputconfig.json After that i can login just fine. I have notification that i am running in the graphics safe mode (nomodeset) but after next reboot/login its gone any my desktop works fine. Looking at logs i'v seen such entries for example: cze 17 19:48:32 TachikomaPC-Neon kwin_wayland[1821]: kwin_scene_opengl: 0x502: GL_INVALID_OPERATION error generated. and are incompatible cze 17 19:48:32 TachikomaPC-Neon kwin_wayland[1821]: kwin_scene_opengl: Invalid framebuffer status: "GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT" cze 17 19:48:32 TachikomaPC-Neon kwin_wayland[1821]: kwin_wayland_drm: Checking test buffer failed! cze 17 19:48:32 TachikomaPC-Neon kwin_wayland[1821]: kwin_core: Applying output config failed! OBSERVED RESULT The PC sometimes freezes when trying to enter Wayland session. EXPECTED RESULT Wayland session should work fine without any PC freezes. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Neon KDE Plasma Version: 6.1 KDE Frameworks Version: 6.3.0 Qt Version: 6.7.0 GPU: Nvidia 4080 GPU Driver Version: 555.52.04 ADDITIONAL INFORMATION I am not sure what causes this problem and i am not 100% sure if it is some bug, but i am posting it here as maybe someone can confirm it.
I have also had this bug. Applying the workaround fixed it. My system: Operating System: KDE neon 6.0 KDE Plasma Version: 6.1.0 KDE Frameworks Version: 6.3.0 Qt Version: 6.7.0 Kernel Version: 6.5.0-41-generic (64-bit) Graphics Platform: Wayland Processors: 12 × Intel® Core™ i7-8750H CPU @ 2.20GHz Memory: 62.7 GiB of RAM Graphics Processor: llvmpipe Manufacturer: Micro-Star International Co., Ltd. Product Name: GS75 Stealth 8SE System Version: REV:1.0 Nvidia Drivers v555.52.04 open.
Please attach the output config that caused the breakage, and the default that KWin generated after deleting / moving the old one. We need to know which setting causes this. (In reply to ssergio-ll from comment #1) > Graphics Processor: llvmpipe Just FYI, you're getting software rendering, there's something wrong with your graphics driver setup.
Created attachment 170598 [details] Working config
Created attachment 170599 [details] Failing config
I have posted 2 configs: 1 working and 1 failing, the one working is not the default one though (i have played with settings a bit, so it probably was updated).
Ok i did one test: - i have enabled HDR - i have rebooted - session failed to start with black screen - i have set highDynamicRange: false - reboot and session still failed to start - i have set wideColorGamut: false - reboot and session starts fine
Dear Bug Submitter, This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information as soon as possible and set the bug status as REPORTED. Due to regular bug tracker maintenance, if the bug is still in NEEDSINFO status with no change in 30 days the bug will be closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging If you have already provided the requested information, please mark the bug as REPORTED so that the KDE team knows that the bug is ready to be confirmed. Thank you for helping us make KDE software even better for everyone!
Ah, it's the same thing as bug 488941, where using the shadow buffer for blending somehow doesn't work *** This bug has been marked as a duplicate of bug 488941 ***