https://bugs.kde.org/show_bug.cgi?id=517409
Bug ID: 517409
Summary: External (second) 4k Thunderbolt screen shows a login
screen that is scaled by 2x vertically (only)
Classification: Plasma
Product: kwin
Version First unspecified
Reported In:
Platform: Ubuntu
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 190546
--> https://bugs.kde.org/attachment.cgi?id=190546&action=edit
Photo showing both screen the 4k being distorted
SUMMARY
My external (second) 4k Thunderbolt screen shows a login screen that is scaled
by 2x vertically (only). After login everything is fine again, it happens only
at login. I see this both with Ubuntu 16.04 (sddm) and KDE Linux
(plasma-login). Nate pointed me here
STEPS TO REPRODUCE
Just let the machine boot to the GUI login and observe the second screen.
OBSERVED RESULT
While the login screen is correct on the built-in screen it is distorted on the
external screen. Both with Ubuntu and KDE-Linux despite them using different
login-managers.
EXPECTED RESULT
The screen on the external display not being distorted.
SOFTWARE/OS VERSIONS
Operating System: KDE Linux 2026-03-10
KDE Plasma Version: 6.6.80
KDE Frameworks Version: 6.25.0
Qt Version: 6.10.2
Kernel Version: 6.19.6-zen1-1-zen (64-bit)
Graphics Platform: Wayland
Processors: 12 × 13th Gen Intel® Core™ i7-1365U
Memory: 32 GiB of RAM (31.0 GiB usable)
Graphics Processor: Intel® Iris® Xe Graphics
Manufacturer: LENOVO
Product Name: 21HNS00100
System Version: ThinkPad X1 Carbon Gen 11
ADDITIONAL INFORMATION
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