https://bugs.kde.org/show_bug.cgi?id=466399
Bug ID: 466399
Summary: Confusion about the primary display after booting with
external screens connected
Classification: Plasma
Product: KScreen
Version: 5.27.1
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: common
Assignee: kscreen-bugs-n...@kde.org
Reporter: jeisenb...@protonmail.com
Target Milestone: ---
Created attachment 156707
--> https://bugs.kde.org/attachment.cgi?id=156707&action=edit
Output of kscreen-doctor -o, xrandr, as well as a screenshot that shows System
Settings and the panel settings dialog
SUMMARY
***
NOTE: If you are reporting a crash, please try to attach a backtrace with debug
symbols.
See
https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports
***
I'm using KDE Plasma on my laptop, a ThinkPad T490. When I'm working at my
desk, I connect it to two external monitors through a USB-C dock (Anker 565). I
want the left monitor to be my primary screen and show my panel, and the right
monitor should be secondary. The laptop's internal screen is disabled.
Whenever I boot my system with the dock connected, the system confuses the
primary display selection. The panel appears on the secondary screen. In total,
three different components on my system seem to have three different opinions
about which display is the primary one:
- If I ask xrandr, it says the internal screen is the primary.
- If I ask System Settings, it says the left external display is the primary
(this is the desired result).
- If I ask the "Panels and Desktops Management" dialog, it says the right
external display is the primary and therefore used to show the panel.
I attach the output of kscreen-doctor -o, xrandr, as well as a screenshot that
shows System Settings and the panel settings dialog.
To fix the issue, I have to manually change the primary display in System
Settings twice. First, I make my secondary screen primary; second, I make my
main monitor primary again. After doing this, xrandr, System Settings and the
panel settings all agree on the primary display and the panel moves to the
correct screen. However, I have to repeat this process after every boot.
The same behavior appears when I use a Thunderbolt dock (Lenovo DK1841) instead
of the USB-C dock. Unfortunately I cannot connect two displays to my laptop
without any external adapter, so I cannot test it without one of the docks in
between.
I'm using X11. The primary display is correctly identified on Wayland.
Please let me know if I can provide any further information that might be
helpful. If you do not consider this a bug in KScreen, I apologize and would be
grateful for any advice about where I can raise this issue instead. Thanks!
STEPS TO REPRODUCE
1. Boot the system with external monitors connected to USB-C dock (SDDM
displays the login screen on all three screens)
2. Sign in
OBSERVED RESULT
The internal screen is disabled (this is good), but the panel appears on the
wrong external screen.
EXPECTED RESULT
The system should correctly remember my primary screen and show the panel on
the correct screen.
SOFTWARE/OS VERSIONS
Windows: --
macOS: --
Linux/KDE Plasma: Fedora 37 / Plasma 5.27.1
(available in About System)
KDE Plasma Version: 5.27.1
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
ADDITIONAL INFORMATION
--
You are receiving this mail because:
You are watching all bug changes.
