Bug 350144

Summary:	Unredirected fullscreen window leaves artifacts when dragged to other screen
Product:	[Plasma] kwin	Reporter:	budimanjojo
Component:	compositing	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED UNMAINTAINED
Severity:	normal
Priority:	NOR
Version First Reported In:	5.3.2
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	qdbus org.kde.KWin /KWin supportInformation

Description budimanjojo 2015-07-12 09:35:45 UTC

When I drag a fullscreen window with alt+clicking the window between monitors (tested on SMPlayer, html or flash videos, and Dota 2, vlc works though) the screen just duplicate into 2. And the screens are not being updated (freezing). Alt tabbing into the window afterward will fix it but it's really annoying.

Comment 1 Thomas Lübking 2015-07-12 19:39:52 UTC

please attach the output of
   qdbus org.kde.KWin /KWin supportInformation

Comment 2 budimanjojo 2015-07-13 07:21:41 UTC

Created attachment 93579 [details]
qdbus org.kde.KWin /KWin supportInformation

There you go, the strange thing is Multi-Head value is set to "no" even if it knows I've got 2 screens

Comment 3 Thomas Lübking 2015-07-13 15:16:52 UTC

multihead != multiple outputs.
Multihead means to have two independend X11 screens (the mouse can cross by default them, but windows never can)

I suspect the problem to be "unredirectFullscreen: true"
run "kcmshell5 kwincompositing" and UNtick "suspend compositor for fullscreen windows", then try again (in very doubt, restart "kwin_x11 --replace &")

Comment 4 budimanjojo 2015-07-13 17:06:56 UTC

Indeed it is the unredirect fullscreen fault. now the alt dragging works. Thank you Lubking :)

Comment 5 Thomas Lübking 2015-07-13 17:18:03 UTC

unredirection won't get you much - if you require more free resources, simply suspend the compositor.

This is however still a bug - we got to figure whether it's ours ;-)

Comment 6 Martin Flöser 2016-11-02 13:53:22 UTC

Support for unredirecting fullscreen windows got removed in Plasma 5.8