When there is an external display connected over PRIME to a laptop that external display does not load anything until after SDDM launches KDE. This, in it of itself, isn't a problem but this is likely the cause of the problem I'm about to describe. You see when logging into KDE the panel configured for the default monitor is loaded on the laptop's internal display, underneath/behind the laptop internal display's panel. This is likely because the external monitors are not active/detected until logging in. KDE is probably 1. detecting that there are no external monitors at first 2. loading the default monitor's panel 3. then detecting the external display(s) 4. loading the panels for the internal display and other external displays Leaving the internal display's panel on top of the default monitor's panel and leaving the default monitor with no panel at all. I see two potential solutions. Either KDE adds some logic to load in panel's later after the external displays are detected or "refresh" the display setup similar to what happens every time a setting in Display Configuration is changed. Alternatively, SDDM could be changed to detect and activate external monitors connected over PRIME and pass that information along to KDE. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Arch Linux KDE Plasma Version: 5.24.4 KDE Frameworks Version: 5.92.0 Qt Version: 5.15.3
> Alternatively, SDDM could be changed to detect and activate external monitors connected > over PRIME and pass that information along to KDE. That's a good idea regardless of what we do in KDE, and I'd encourage you to report it to https://github.com/sddm/sddm/issues. In principle, the PRIME-connected external screen appearing after login shouldn't be a problem. Is that screen marked as "Primary" in System Settings > Display & Monitor > Display Configuration? If it's not, does the problem go away if you set it as the primary screen? The "primary monitor" setting mostly exists as a hint for Plasma to know where to put its main panel.
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(In reply to Nate Graham from comment #1) > In principle, the PRIME-connected external screen appearing after login > shouldn't be a problem. Is that screen marked as "Primary" in System > Settings > Display & Monitor > Display Configuration? If it's not, does the > problem go away if you set it as the primary screen? The "primary monitor" > setting mostly exists as a hint for Plasma to know where to put its main > panel. One of the external PRIME-connected displays is set as the primary monitor.
This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!