SUMMARY: When opening nearly all applications, but mainly seen with Dolphin, there is a noticeable 0.5s stutter where the entire system (mouse included) freezes. The animation of the window opening is then laggy (loss of FPS) whilst the application opens. Opening another instance of the same app then causes no issues, and the issue seems quite random (sometimes it's noticable, other times it's not. STEPS TO REPRODUCE 1. Open Dolphin from Pinned Task in Task Manager, or via Baloo / Menu OBSERVED RESULT Micro stutter whilst the application loads EXPECTED RESULT Seamless and smooth open of application without stutter SOFTWARE VERSIONS KDE Plasma Version: 5.13.5 KDE Frameworks Version: 5.50.0 Qt Version: 5.11.2 ADDITIONAL INFORMATION Intel HD Graphics 640 on Intel Corei5 7200U Processor. MODSET Drivers are worse, xf86-video-intel mitigates the issue somewhat. Tested on Archlinux and Manjaro. Issue is present on both systems running the same versions listed above. Seems that this issue only occurred for me after the 5.13.5 update roughly 3 days ago.
Created attachment 115226 [details] Log File
No stutter here with 5.13.5, Fw 5.50 and Qt 5.11.1
(In reply to Rik Mills from comment #2) > No stutter here with 5.13.5, Fw 5.50 and Qt 5.11.1 I wonder if the issue is QT then? Are you using Intel HD graphics on X11?
QT was updated to version 5.11.2 on the 20th of September which is the same time that this issue occurred. Tests under Gnome by another user renders the same result. This seems to be an issue with the latest version of QT instead of with KDE
Yep, we have multiple reports of this with Qt 5.11.2. Please file a bug on https://bugreports.qt.io/ and mention the link here in the URL field. Thanks!
*** Bug 399041 has been marked as a duplicate of this bug. ***
Thanks Chris!
*** Bug 400315 has been marked as a duplicate of this bug. ***