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I upgraded Kubuntu 24.04 to 24.10 beta (latest updates from today (03 Oct)).
Now I can't get dual monitors to work. If I plugin a second Monitor or start
with 2 monitors plugged in, I get a black screen with only the mouse cursor
showing up. No rightclick-menu or other menu is working.
With only one monitor plugged in, I have the normal desktop.
Here is the dmesg-output:
https://pastebin.com/QHjczgVi
I see some error regarding apparmor (DENIED) and plasmashell after
plugging in the second monitor.
Code from dmesg:
[ 6393.475040] audit: type=1400 audit(1727796656.562:41439): apparmor="DENIED"
operation="exec" class="file" info="no new privs" error=-1
profile="plasmashell" name="/usr/lib/qt6/libexec/QtWebEngineProcess" pid=14557
comm="plasmashell" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0
target="unconfined"
[ 6393.485991] audit: type=1400 audit(1727796656.573:41440): apparmor="DENIED"
operation="exec" class="file" info="no new privs" error=-1
profile="plasmashell" name="/usr/lib/qt6/libexec/QtWebEngineProcess" pid=14558
comm="plasmashell" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0
target="unconfined"
[ 6393.495670] traps: plasmashell[2525] trap int3 ip:780d4cf7cb41
sp:7ffc1c391500 error:0 in
libQt6WebEngineCore.so.6.6.2[3b7cb41,780d49f51000+8cd1000]
[ 6404.026157] ibus-ui-gtk3[2965]: segfault at 0 ip
[URL="tel:0000000000000000"]0000000000000000[/URL] sp 00007ffc50f19468 error 14
likely on CPU 2 (core 2, socket 0)
[ 6404.026167] Code: Unable to access opcode bytes at 0xffffffffffffffd6.
[ 6404.050535] fbcon: Taking over console
[ 6404.224780] Console: switching to colour frame buffer device 210x65
[ 6406.713515] audit: type=1400 audit(1727796669.801:41441): apparmor="DENIED"
operation="exec" class="file" info="no new privs" error=-1
profile="plasmashell" name="/usr/lib/qt6/libexec/QtWebEngineProcess" pid=14822
comm="plasmashell" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0
target="unconfined"
[ 6406.717757] audit: type=1400 audit(1727796669.805:41442): apparmor="DENIED"
operation="exec" class="file" info="no new privs" error=-1
profile="plasmashell" name="/usr/lib/qt6/libexec/QtWebEngineProcess" pid=14823
comm="plasmashell" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0
target="unconfined"
[ 6406.721376] traps: plasmashell[14763] trap int3 ip:76eb74f7cb41
sp:7ffeb9ca5370 error:0 in
libQt6WebEngineCore.so.6.6.2[3b7cb41,76eb71f51000+8cd1000]
[ 6408.674411] audit: type=1400 audit(1727796671.762:41443): apparmor="DENIED"
operation="exec" class="file" info="no new privs" error=-1
profile="plasmashell" name="/usr/lib/qt6/libexec/QtWebEngineProcess" pid=14892
comm="plasmashell" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0
target="unconfined"
[ 6408.678980] audit: type=1400 audit(1727796671.766:41444): apparmor="DENIED"
operation="exec" class="file" info="no new privs" error=-1
profile="plasmashell" name="/usr/lib/qt6/libexec/QtWebEngineProcess" pid=14893
comm="plasmashell" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0
target="unconfined"
[ 6408.682935] traps: plasmashell[14834] trap int3 ip:747358f7cb41
sp:7ffe7e8b8210 error:0 in
libQt6WebEngineCore.so.6.6.2[3b7cb41,747355f51000+8cd1000]
[ 6410.411720] audit: type=1400 audit(1727796673.499:41445): apparmor="DENIED"
operation="exec" class="file" info="no new privs" error=-1
profile="plasmashell" name="/usr/lib/qt6/libexec/QtWebEngineProcess" pid=14961
comm="plasmashell" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0
target="unconfined"
[ 6410.415979] audit: type=1400 audit(1727796673.503:41446): apparmor="DENIED"
operation="exec" class="file" info="no new privs" error=-1
profile="plasmashell" name="/usr/lib/qt6/libexec/QtWebEngineProcess" pid=14962
comm="plasmashell" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0
target="unconfined"
[ 6410.419445] traps: plasmashell[14903] trap int3 ip:7fd7d8f7cb41
sp:7fff50c60ec0 error:0 in
libQt6WebEngineCore.so.6.6.2[3b7cb41,7fd7d5f51000+8cd1000]
Edit:
heres the gdb output:
[New LWP 2541]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007bd7ab3256a0 in __GI_ppoll (fds=0x5bc37a5b7570, nfds=10,
timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:42
warning: 42 ../sysdeps/unix/sysv/linux/ppoll.c: Datei oder Verzeichnis nicht
gefunden
(gdb)
(gdb) continue
Continuing.
(gdb) [New Thread 0x7bd6fcc006c0 (LWP 5728)]
[Detaching after fork from child process 5729]
[Detaching after fork from child process 5730]
[Detaching after fork from child process 5731]
Thread 1 "plasmashell" received signal SIGTRAP, Trace/breakpoint trap.
0x00007bd614f7cb41 in ?? () from /lib/x86_64-linux-gnu/libQt6WebEngineCore.so.6
ProblemType: Bug
DistroRelease: Ubuntu 24.10
Package: plasma-workspace 4:6.1.5-0ubuntu1
ProcVersionSignature: Ubuntu 6.11.0-8.8-generic 6.11.0
Uname: Linux 6.11.0-8-generic x86_64
ApportVersion: 2.30.0-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: KDE
Date: Thu Oct 3 11:58:07 2024
ExecutablePath: /usr/bin/plasmashell
InstallationDate: Installed on 2022-11-18 (685 days ago)
InstallationMedia: Kubuntu 22.10 "Kinetic Kudu" - Release amd64 (20221020)
ProcEnviron:
LANG=de_DE.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
XDG_RUNTIME_DIR=<set>
SourcePackage: plasma-workspace
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: plasma-workspace (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug oracular third-party-packages wayland-session
--
starting with 2 monitors or plugging in a second monitor crashes plasmashell
https://bugs.launchpad.net/bugs/2083596
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