https://bugs.kde.org/show_bug.cgi?id=520517
Bug ID: 520517
Summary: Primary screen freezes on startup while secondary
screen stays ok
Classification: Plasma
Product: KScreen
Version First 6.6.4
Reported In:
Platform: Ubuntu
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: common
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
DESCRIPTION
I use a laptop with an external monitor (reproduced with direct USB-C
connection, and HDMI to a dock + USB-C from dock to laptop). When starting, the
laptop monitor is frozen, while the external monitor works normally.
Entering Sleep and waking the laptop unfreezes the primary monitor.
STEPS TO REPRODUCE
1. Connect an external monitor to the laptop
2. Turn on the laptop
OBSERVED RESULT
Laptop (primary) screen freezes. There is only the wallpaper, and the mouse
pointer in the exact middle. No panels either (it freezes before they load I
suppose). Everything else behaves normally: mouse pointer can leave the working
screen (it just doesn't appear on the frozen one), Display Configuration shows
both screens working.
EXPECTED RESULT
Laptop screen should not be frozen.
SOFTWARE/OS VERSIONS
Operating System: Kubuntu 26.04 LTS
KDE Plasma Version: 6.6.4
KDE Frameworks Version: 6.24.0
Qt Version: 6.10.2
Kernel Version: 7.0.0-15-generic (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 PRO 7840U w/ Radeon 780M Graphics
Memory: 32 GiB of RAM (30.1 GiB usable)
Graphics Processor: AMD Radeon 780M Graphics
Manufacturer: LENOVO
System Version: ThinkPad T14 Gen 4
ADDITIONAL INFORMATION
Here is an excerpt from the output of `kscreen-doctor -o`:
Output: 1 eDP-1 d80af5f2-6b5f-4a25-9c28-e0b76e83636c
enabled
connected
priority 1
Panel
...
Geometry: 1920,180 1440x900
...
Output: 2 DP-2 62f880e2-e105-4e97-8015-bc2c02f6b95c
enabled
connected
priority 2
DisplayPort
...
Geometry: 0,0 1920x1080
...
The issue started happening a few days ago. I do not remember the exact date,
it must have been between May 18 or May 21.
Here is my update history from the last days in /var/log/apt/history.log :
Start-Date: 2026-05-18 14:41:40
Commandline: packagekit role='update-packages'
Install: linux-headers-6.17.0-29:amd64 (6.17.0-29.29, automatic),
linux-tools-6.17.0-29-generic:amd64 (6.17.0-29.29, automatic),
linux-image-6.17.0-29-generic:amd64 (6.17.0-29.29, automatic),
linux-headers-6.17.0-29-generic:amd64 (6.17.0-29.29, automatic),
linux-tools-6.17.0-29:amd64 (6.17.0-29.29, automatic),
linux-modules-6.17.0-29-generic:amd64 (6.17.0-29.29, automatic)
Upgrade: linux-tools-common:amd64 (6.17.0-23.23, 6.17.0-29.29),
linux-headers-generic:amd64 (6.17.0-23.23, 6.17.0-29.29), linux-perf:amd64
(6.17.0-23.23, 6.17.0-29.29), linux-generic:amd64 (6.17.0-23.23, 6.17.0-29.29),
linux-image-generic:amd64 (6.17.0-23.23, 6.17.0-29.29), bpftool:amd64
(7.7.0+6.17.0-23.23, 7.7.0+6.17.0-29.29), linux-libc-dev:amd64 (6.17.0-23.23,
6.17.0-29.29)
End-Date: 2026-05-18 14:42:14
Start-Date: 2026-05-20 18:18:48
Commandline: packagekit role='update-packages'
Upgrade: openvpn:amd64 (2.7.0-1ubuntu1, 2.7.0-1ubuntu1.1),
libgnutls28-dev:amd64 (3.8.12-2ubuntu1, 3.8.12-2ubuntu1.1), gnutls-bin:amd64
(3.8.12-2ubuntu1, 3.8.12-2ubuntu1.1), rsync:amd64 (3.4.1+ds1-7,
3.4.1+ds1-7ubuntu0.2), libunbound8:amd64 (1.24.2-1ubuntu2, 1.24.2-1ubuntu2.1),
libgnutls-dane0t64:amd64 (3.8.12-2ubuntu1, 3.8.12-2ubuntu1.1),
accountsservice:amd64 (23.13.9-8ubuntu5, 23.13.9-8ubuntu5.1),
libgnutls30t64:amd64 (3.8.12-2ubuntu1, 3.8.12-2ubuntu1.1),
libgnutls-openssl27t64:amd64 (3.8.12-2ubuntu1, 3.8.12-2ubuntu1.1),
libaccountsservice0:amd64 (23.13.9-8ubuntu5, 23.13.9-8ubuntu5.1)
End-Date: 2026-05-20 18:18:55
Start-Date: 2026-05-21 20:56:41
Commandline: apt upgrade
Requested-By: joseph (1000)
Upgrade: bubblewrap:amd64 (0.11.1-1, 0.11.1-1ubuntu0.1), libarchive13t64:amd64
(3.8.5-1ubuntu2, 3.8.5-1ubuntu2.1)
End-Date: 2026-05-21 20:56:44
Start-Date: 2026-05-22 16:27:54
Commandline: /usr/bin/unattended-upgrade
Upgrade: bind9-host:amd64 (1:9.20.18-1ubuntu2, 1:9.20.18-1ubuntu2.1),
bind9-dnsutils:amd64 (1:9.20.18-1ubuntu2, 1:9.20.18-1ubuntu2.1),
bind9-libs:amd64 (1:9.20.18-1ubuntu2, 1:9.20.18-1ubuntu2.1)
End-Date: 2026-05-22 16:27:57
Start-Date: 2026-05-22 16:27:58
Commandline: /usr/bin/unattended-upgrade
Upgrade: libpq5:amd64 (18.3-1, 18.4-0ubuntu0.26.04.1)
End-Date: 2026-05-22 16:27:59
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