SUMMARY On X11, with KWIN_COMPOSE=N, it is impossible to run another compositor STEPS TO REPRODUCE 1. Run KWIN_COMPOSE=N kwin_x11 --replace 2. run picom OBSERVED RESULT picom --diagnostics **Version:** v12.5 (/startdir/picom revision a456d43) ### Extensions: * Shape: Yes * RandR: Yes * Present: Present ### Misc: * Use Overlay: No (Another compositor is already running) * Config file specified: None * Config file used: /etc/xdg/picom.conf ### Drivers (inaccurate): modesetting ### Backend: glx * Driver vendors: * GLX: Mesa Project and SGI * GL: Intel * GL renderer: Mesa Intel(R) Iris(R) Xe Graphics (TGL GT2) * Accelerated: 1 [ 30/01/2025 14:17:35.954 egl_init WARN ] The egl backend is still experimental, use with care. ### Backend: egl * Driver vendors: * EGL: Mesa Project * EGL driver: iris * GL: Intel * GL renderer: Mesa Intel(R) Iris(R) Xe Graphics (TGL GT2) EXPECTED RESULT Picom shuld not found another compositor running SOFTWARE/OS VERSIONS Operating System: Manjaro Linux KDE Plasma Version: 6.2.5 KDE Frameworks Version: 6.10.0 Qt Version: 6.8.1 Kernel Version: 6.13.0-1-MANJARO (64-bit) Graphics Platform: X11 Processors: 8 × 11th Gen Intel® Core™ i5-1135G7 @ 2.40GHz Memory: 15.4 GiB of RAM Graphics Processor: Mesa Intel® Iris® Xe Graphics
Using KWin with other compositors is not and won't be supported, sorry.
(In reply to Nicolas Fella from comment #1) > Using KWin with other compositors is not and won't be supported, sorry. I understand, although technically you should not 'support' anything, simply allow it. Best.