lubuntu mantic live - on enabling monitors crash

[Chris Guiver]

Lubuntu mantic live test on
- dell [optiplex] 7050 (i5-6500, 16gb, intel hd530/i915, radeon cedar)

The system boots using only the (3) i915 connected displays; but I also have a radeon card with (2) more displays.

I opened Monitor.Settings & clicked 'enable' on the two 'disabled' displays, I may have also moved screens around too, but on clicking APPLY the session ended (and after a delay I was back at greeter).

Crash files exist in /var/crash for Xorg, libexec_kf5_kscreen_backend & lxqt-globalkeysd (all with some date/time)

** expected outcome

On alteration in Monitor.Settings of config, clicking apply will action change

** actual outcome

Change made in Monitor.Settings (2 disabled screens enabled) & on clicking APPLY session ended

ProblemType: Crash
DistroRelease: Ubuntu 23.10
Package: libkf5screen-bin 4:5.27.7-0ubuntu1
Uname: Linux 6.3.0-7-generic x86_64
Architecture: amd64
Date: Tue Aug 15 02:05:08 2023
ExecutablePath: /usr/lib/x86_64-linux-gnu/libexec/kf5/kscreen_backend_launcher
ExecutableTimestamp: 1690906506
ProcCmdline: /usr/lib/x86_64-linux-gnu/libexec/kf5/kscreen_backend_launcher
ProcCwd: /home/lubuntu
ProcEnviron:
 LANG=C.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 XDG_RUNTIME_DIR=<set>
Signal: 11
SourcePackage: libkscreen
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo users

[Apport retracing service (apport)]

StacktraceTop:
 XRandRCrtc::update (this=0x558e2807e490) at /usr/src/libkscreen-4:5.27.7-0ubuntu1/backends/xrandr/xrandrcrtc.cpp:90
 XRandRConfig::enableOutput (this=this@entry=0x558e27ece6d0, kscreenOutput=...) at /usr/src/libkscreen-4:5.27.7-0ubuntu1/backends/xrandr/xrandrconfig.cpp:533
 XRandRConfig::applyKScreenConfig (this=0x558e27ece6d0, config=...) at /usr/src/libkscreen-4:5.27.7-0ubuntu1/backends/xrandr/xrandrconfig.cpp:308
 XRandR::setConfig (this=<optimized out>, config=...) at /usr/src/libkscreen-4:5.27.7-0ubuntu1/backends/xrandr/xrandr.cpp:191
 XRandR::setConfig (this=<optimized out>, config=...) at /usr/src/libkscreen-4:5.27.7-0ubuntu1/backends/xrandr/xrandr.cpp:184

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
https://iso.qa.ubuntu.com/qatracker/reports/bugs/2031358

[Scarlett Gately Moore (scarlettmoore)]

possibly related? https://bugs.kde.org/show_bug.cgi?id=472280

Please

sudo dmesg > dmesg.txt

journalctl -b-1 > prevboot.txt

run
journalctl -f | tee > system.log

in a terminal until the crash happens. can ctrl-c out of it.

Thanks