Hi,
After using Plasma on Wayland without issue for a few years on an AMD-based laptop, I installed some updates a few months ago and rebooted to find that Plasma now hangs after I enter my login credentials. The mouse cursor just stops moving on the splash screen, and I can’t switch to a VT nor get a response from the CapsLock LED. I’m not sure how to interpret the logfiles, but this bit looked possibly relevant in the bug report I opened on Pop!_OS’s issue tracker:
2025-12-13T21:04:54.264167+00:00 localhost kwin_wayland_wrapper[264829]: Errors from xkbcomp are not fatal to the X server
2025-12-13T21:04:54.265734+00:00 localhost kwin_wayland_wrapper[264799]: (EE)
2025-12-13T21:04:54.265851+00:00 localhost kwin_wayland_wrapper[264799]: (EE) Backtrace:
2025-12-13T21:04:54.265986+00:00 localhost kwin_wayland_wrapper[264799]: (EE) 0: /usr/bin/Xwayland (0x577366500000+0x176ce2) [0x577366676ce2]
2025-12-13T21:04:54.266040+00:00 localhost kwin_wayland_wrapper[264799]: (EE) 1: /usr/bin/Xwayland (0x577366500000+0x176de6) [0x577366676de6]
2025-12-13T21:04:54.266089+00:00 localhost kwin_wayland_wrapper[264799]: (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x72c5f0a00000+0x45330) [0x72c5f0a45330]
2025-12-13T21:04:54.266132+00:00 localhost kwin_wayland_wrapper[264799]: (EE) 3: /lib/x86_64-linux-gnu/libwayland-client.so.0 (wl_proxy_get_version+0x4) [0x72c5f1209204]
2025-12-13T21:04:54.266200+00:00 localhost kwin_wayland_wrapper[264799]: (EE) 4: /usr/bin/Xwayland (0x577366500000+0x4b62a) [0x57736654b62a]
2025-12-13T21:04:54.266241+00:00 localhost kwin_wayland_wrapper[264799]: (EE) 5: /usr/bin/Xwayland (0x577366500000+0x42ece) [0x577366542ece]
2025-12-13T21:04:54.266285+00:00 localhost kwin_wayland_wrapper[264799]: (EE) 6: /usr/bin/Xwayland (0x577366500000+0x110da7) [0x577366610da7]
2025-12-13T21:04:54.266328+00:00 localhost kwin_wayland_wrapper[264799]: (EE) 7: /usr/bin/Xwayland (0x577366500000+0xc3b40) [0x5773665c3b40]
2025-12-13T21:04:54.266378+00:00 localhost kwin_wayland_wrapper[264799]: (EE) 8: /usr/bin/Xwayland (0x577366500000+0xad0c1) [0x5773665ad0c1]
2025-12-13T21:04:54.266421+00:00 localhost kwin_wayland_wrapper[264799]: (EE) 9: /usr/bin/Xwayland (0x577366500000+0x3bbb6) [0x57736653bbb6]
2025-12-13T21:04:54.266468+00:00 localhost kwin_wayland_wrapper[264799]: (EE) 10: /lib/x86_64-linux-gnu/libc.so.6 (0x72c5f0a00000+0x2a1ca) [0x72c5f0a2a1ca]
2025-12-13T21:04:54.266512+00:00 localhost kwin_wayland_wrapper[264799]: (EE) 11: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0x8b) [0x72c5f0a2a28b]
2025-12-13T21:04:54.266552+00:00 localhost kwin_wayland_wrapper[264799]: (EE) 12: /usr/bin/Xwayland (0x577366500000+0x3d8b5) [0x57736653d8b5]
2025-12-13T21:04:54.266595+00:00 localhost kwin_wayland_wrapper[264799]: (EE)
2025-12-13T21:04:54.266633+00:00 localhost kwin_wayland_wrapper[264799]: (EE) Segmentation fault at address 0x40
2025-12-13T21:04:54.266672+00:00 localhost kwin_wayland_wrapper[264799]: (EE)
2025-12-13T21:04:54.266710+00:00 localhost kwin_wayland_wrapper[264799]: Fatal server error:
2025-12-13T21:04:54.266754+00:00 localhost kwin_wayland_wrapper[264799]: (EE) Caught signal 11 (Segmentation fault). Server aborting
2025-12-13T21:04:54.266796+00:00 localhost kwin_wayland_wrapper[264799]: (EE)
I’m using Pop!_OS which doesn’t have Plasma 6 yet. I tried adding the Kubuntu backports PPA but apt still doesn’t show an option for Plasma 6.
I’m guessing it’s some kind of weird interaction between the Radeon driver, Plasma and Wayland. But other Wayland compositors work with no problems (I tried Sway, Cosmic and one or two others).
Can anyone share some advice on how to either install Plasma 6, or other tips on debugging this hang?