https://bugs.kde.org/show_bug.cgi?id=522519
Bug ID: 522519
Summary: Login Manager crashes whith USB-C Hub, external
Monitors and Displaylink Driver
Classification: Plasma
Product: plasma-login-manager
Version First unspecified
Reported In:
Platform: Neon
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Target Milestone: ---
Created attachment 193951
--> https://bugs.kde.org/attachment.cgi?id=193951&action=edit
journalctl output
DESCRIPTION
I installed plasma-login-manager a few weks ago and it worked well with my
notebook. Today I had to use my usb-c hub which connects two external monitors
with my notebook (via displaylink driver). At the end of the boot process when
the login manager should have shown up, I only get a black screen. Reboot
didn't help.
So I switched to sddm again and the issue is gone. So I assume that
plasma-login-manager is the reason of the black screen.
Looking at journalctl I stumbled over the following log entry:
Jul 01 22:09:35 christian-pc systemd-coredump[1965]: Process 1884
(kwin_wayland) of user 996 dumped core.
Module libgomp.so.1 from deb gcc-14-14.2.0-4ubuntu2~24.04.1.amd64
Module libgcc_s.so.1 from deb gcc-14-14.2.0-4ubuntu2~24.04.1.amd64
Module libudev.so.1 from deb systemd-255.4-1ubuntu8.16.amd64
Module libzstd.so.1 from deb libzstd-1.5.5+dfsg2-2build1.1.amd64
Module libstdc++.so.6 from deb gcc-14-14.2.0-4ubuntu2~24.04.1.amd64
Module libsystemd.so.0 from deb systemd-255.4-1ubuntu8.16.amd64
Stack trace of thread 1953:
#0 0x0000732c3e49eb2c __pthread_kill_implementation (libc.so.6 + 0x9eb2c)
#1 0x0000732c3e44527e __GI_raise (libc.so.6 + 0x4527e)
#2 0x0000732c4379e201 _ZN6KCrash19defaultCrashHandlerEi (libKF6Crash.so.6
+ 0x8201)
#3 0x0000732c3e445330 __restore_rt (libc.so.6 + 0x45330)
#4 0x0000732c2ff4470a n/a (n/a + 0x0)
#5 0x0000732c2dc675f5 n/a (libgallium-25.2.8-0ubuntu0.24.04.2.so +
0x8675f5)
#6 0x0000732c2dc677b0 n/a (libgallium-25.2.8-0ubuntu0.24.04.2.so +
0x8677b0)
#7 0x0000732c2dc67189 n/a (libgallium-25.2.8-0ubuntu0.24.04.2.so +
0x867189)
#8 0x0000732c2dc67505 n/a (libgallium-25.2.8-0ubuntu0.24.04.2.so +
0x867505)
#9 0x0000732c2dc66618 n/a (libgallium-25.2.8-0ubuntu0.24.04.2.so +
0x866618)
#10 0x0000732c2dc66717 n/a (libgallium-25.2.8-0ubuntu0.24.04.2.so +
0x866717)
#11 0x0000732c2d999e0c n/a (libgallium-25.2.8-0ubuntu0.24.04.2.so +
0x599e0c)
#12 0x0000732c3e49caa4 start_thread (libc.so.6 + 0x9caa4)
#13 0x0000732c3e529c6c __clone3 (libc.so.6 + 0x129c6c)
Stack trace of thread 1884:
#0 0x0000732c3ee96290 n/a (libQt6Core.so.6 + 0x296290)
ELF object binary architecture: AMD x86-64
I cannot say if this is the error that leads to my issue. But it only occured
when I boot my notebook with the multi monitor setup.
In the attached log file you'll find the context of the mentioned log entry.
If you need more info, please tell me.
SOFTWARE/OS VERSIONS
Operating System: KDE neon User Edition
KDE Plasma Version: 6.7.0
KDE Frameworks Version: 6.27.0
Qt Version: 6.11.1
Kernel Version: 6.17.0-122035-tuxedo (64-bit)
Graphics Platform: X11
Processors: 8 × AMD Ryzen 7 4700U with Radeon Graphics
Memory: 16 GiB of RAM (15.0 GiB usable)
Graphics Processor 1: AMD Radeon Graphics
Graphics Processor 2: AMD Radeon Graphics
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