Using UE4Editor( UnrealEngine 4 Editor) with the pop-ups smearing and sever lag in the node(blueprints) editor window. Reproducible: Always Steps to Reproduce: 1. Build Editor 2. Run Editor 3. Hover over items to get pop up, and drag variables from the left pane onto the blueprint region and watch it lag. Actual Results: Pop-ups and dragged objects cause sever lag in the UI. Expected Results: Pop-ups come and go with no issue, no UI lag in the editor.
Please provide output of: qdbus org.kde.KWin /KWin supportInformation when the problem is visible.
Perf: https://dl.dropboxusercontent.com/u/71062164/UnrealEngine/Perf.tar.xz xtrace: https://dl.dropboxusercontent.com/u/71062164/UnrealEngine/xtrace-logs.tar.xz
If you can provide the information in requested in comment #1, please add it.
This is before UE4Editor starts: https://gist.github.com/salamanderrake/319407e000873a944dea19ddaede5e24 This is after UE4Editor starts: https://gist.github.com/salamanderrake/e841f3ddcf8a0e0b5e0fe8daa52acd6b The problem is that UE4Editor is shutting off the compositor for the window manager when it gets better performance with the compositor enabled. Its a game engine with an editor built on top of it, so the wm or the internal code causes it to shut off the wm composite manager. I may just close this as its not an issue on your end.
As the problem is with pure non-composited setup it's not a bug in our system. In case you have intel hardware consider switching to the modesettings xorg module. Otherwise consider creating a window specific rule to disallow this window to block compositing.
How do I create a window specific rule?
Nevermind I found the option.