Bug 505398

Summary:	External display doesn't show tool bar and applications
Product:	[Plasma] plasmashell	Reporter:	Ilpo Kantonen <ilpo>
Component:	Containment	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED INTENTIONAL
Severity:	normal	CC:	hein, nate, notmart
Priority:	NOR	Keywords:	multiscreen
Version First Reported In:	6.3.91
Target Milestone:	1.0
Platform:	Neon
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Ilpo Kantonen 2025-06-09 22:15:31 UTC

SUMMARY


STEPS TO REPRODUCE
1. Log in

OBSERVED RESULT
Login screen is ok on the outer display (Asus 27"). I had earlier VGA cable from laptop to display. Now I changed it to Hama HDMI cable. And that didn't solve problem. Login works ok, so I think that SDDM works ok to display. But then when Plasma starts, Plasma shows only green background as like on laptop. And writes text to right bottom KDE Plasma 6.4. beeta 2. But not the tool bar. When I start some application, it doesn't appear to Asus screen but it is only on laptop screen.

So there is probably but somewhere in Plasma. Same occurs with VGA cable and HDMI cable.

EXPECTED RESULT
Plasma displays tool bar and applications on desktop.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: KDE Neon Test Edition (updated every day)
KDE Plasma Version: 6.3.91 (Plasma 6.4 beeta 2)
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.0
Linux kernel: 6.11.0-26-generic (64-bit)
Graphics: Wayland

Comment 1 Nate Graham 2025-06-10 14:34:37 UTC

Thanks for the bug report! Unfortunately I'm having a hard time figuring out what bug is being reported here. Maybe a video would help? Can you use your phone to take a video of what's happening, in such a manner that visually shows the problem happening?

Comment 2 Ilpo Kantonen 2025-06-10 17:07:18 UTC

Problem solved when I changed big display first in System settings and laptop screen second. Now tool bar appeared to big display. But on laptop there were only background without tool bar. Is that a bug? Iam very sorry that I raised bug report when the reason was settings change.

Comment 3 Nate Graham 2025-06-12 14:09:21 UTC

Not a bug; sounds like everything is working as expected. Your Plasma panels don't automatically get duplicated onto external displays, which is a different from how Windows does it.