Bug 192736

Summary:	Windows appear on two taskbars while displayed on one monitor (dual monitor setup)
Product:	[Plasma] plasma4	Reporter:	alex
Component:	widget-taskbar	Assignee:	Plasma Bugs List <plasma-bugs>
Status:	RESOLVED FIXED
Severity:	normal	CC:	aseigo, bugzilla, evelyne24, finex, ivo, kde, registrofx
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed In:

Description alex 2009-05-15 08:30:18 UTC

Version:            (using KDE 4.2.2)
OS:                Linux
Installed from:    Ubuntu Packages

On a dual monitor setup the tasklist plasmoid does not behave as it should. 
I have one panel on each screen with a tasklist plasmoid on each of them.

Beside the fact I selected "only display windows from current screen"
and "display only windows from current desktop" some windows appears
randomly on the two tasklists. The only way to make disappear the wrong
occurence is to reduce or move the faulty window. I am sure the
window is not overlapping on the two screens because it is maximized. I
also checked the dual monitor setup (tried to change the absolute
position of one screen to be sure they are not overlapping)

I am not able to find the right way to reproduce it each time but it
happens during regular use. I do not have this type of behaviour on
Gnome with the same hardware.

I think it is related to the way the NVIDIA driver handles the twinview feature.

Setup :
Shuttle XPC
Core 2
Nvidia 6200 with Dual screen and NVIDIA driver 180
Kubuntu Jaunty

Comment 1 clcevboxvjeo 2009-06-30 17:44:47 UTC

This bug still exists in KDE 4.2.4.

I have extended desktop, with one panel and taskbar on each of the two desktops. Both taskbars are set to "Only show tasks from the current desktop" and "Only show tasks from the current screen". When I have some window on the right monitor, it shows in both taskbars. When I move the window to the left monitor, it disappears from both taskbars.

Comment 2 bugzilla 2009-06-30 18:35:49 UTC

I am also experiencing the same issue like pholie. Windows in right screen of extended display appears in task bar two times, when moving the windows to the left side, the windows disappears from task bar, and so on..

I have an intel X3100 graphics card, so I think it is no NVIDIA related.

Comment 3 Aaron J. Seigo 2009-08-06 00:14:47 UTC

can one of you confirm with 4.3?

Comment 4 Evelina Vrabie 2009-10-16 15:00:04 UTC

(In reply to comment #3)
> can one of you confirm with 4.3?

Yes, I have Kubuntu 9.10 beta (with KDE 4.3.2) and I have the same problem: when the second monitor is plugged-in and the second panel appears, the Task Manager plasmoid shows windows from the other panel, even though I have selected "Only show tasks from the current desktop/screen".

Thanks,
Evelyne

Comment 5 Nicolas L. 2010-06-07 08:47:42 UTC

Can you reproduce using KDE 4.4.4 or 4.5beta?

Comment 6 FiNeX 2010-07-11 11:54:36 UTC

Cannot reproduce anymore using 4.4.5.

Comment 7 Jairo Honorio 2015-06-17 05:15:46 UTC

Still exists in 4.11.11

With oxygen decoration -> Configure Decoration -> Border Size, in Normal the bug doesn't appear. In Larger or bigger, the bug appears again.