SUMMARY The lock screen does not follow display resolution changes. E. g. when using a notebook with external monitor, the lock screen stays at the size it was at screen locking instead of resizing. STEPS TO REPRODUCE 1. Lock screen 2. Change display setup (connect/disconnect external monitor with different resolution and having the notebook monitor deactivated in system settings) OBSERVED RESULT Lock screen stays at the old size. Login and re-lock leads to correct size. EXPECTED RESULT Lock screen should follow display resolution. SOFTWARE/OS VERSIONS Operating System: openSUSE Tumbleweed 20210502 KDE Plasma Version: 5.21.4 KDE Frameworks Version: 5.81.0 Qt Version: 5.15.2 Kernel Version: 5.12.0-2-default OS Type: 64-bit Graphics Platform: X11 Processors: 8 × AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx Memory: 11.3 GiB of RAM Graphics Processor: AMD Radeon™ Vega 8 Graphics
Also probably related to Bug #440639 (about greeter screen becoming black after unplugging external monitor, which probably share the same root cause, i.e. : kscreenlocker is not aware of the change or does not react to it).
*** This bug has been marked as a duplicate of bug 412527 ***