Created attachment 136029 [details] KDE Plasma 5.21 screenshot: crisp Firefox and KCalc windows, blurry Plasma panel and launcher SUMMARY On a HiDPI display under Plasma Wayland 5.21 with 200% display scaling, the panel, launcher etc. are rendered blurry, while KDE and Qt applications, regular Wayland applications and window decorations are not. STEPS TO REPRODUCE 1. Set display scaling to 200%. 2. Launch a few Qt applications. 3. Look at the panel or open the application launcher. OBSERVED RESULT The panel and launcher are blurry, the application windows are not. (See screenshot.) EXPECTED RESULT The panel and launcher should be crisp. SOFTWARE/OS VERSIONS Operating System: openSUSE Tumbleweed 20210220 KDE Plasma Version: 5.21.0 KDE Frameworks Version: 5.79.0 Qt Version: 5.15.2 Kernel Version: 5.10.16-1-default OS Type: 64-bit Graphics Platform: Wayland Processors: 8 × Intel® Core™ i7-8550U CPU @ 1.80GHz Memory: 15.5 GiB of RAM Graphics Processor: Mesa DRI Intel® UHD Graphics 620 ADDITIONAL INFORMATION Note that this is not bug 412089, the window decorations are crisp. I encountered this after running into bug 432099 (having to set the display scaling once again in Wayland after setting it in X11).
Update: this is gone after a logout. It happens again whenever I change the display scaling, until the next login. So a more accurate description would be: "After changing the display scaling in the Wayland session, Plasma and applets are rendered blurry until the next login."
Works for me FWIW. Does it fix itself if you clear the Plasma cache and restart plasmashell? Try this: rm -rf ~/.cache/*plasma* plasmashell --replace
Thank you. Clearing the Plasma cache does solve the problem for the Plasma panel. However, if any other KDE applications were open before changing the display scaling, they are still blurry. This happened to me with Yakuake, but also with Plasma notifications. I'm attaching a screenshot taken right after clearing the cache and restarting Plasma - it shows the Yakuake window.
Created attachment 136108 [details] KDE Plasma 5.21 screenshot after clearing Plasma cache: crisp Firefox and Plasma panel, blurry Yakuake
>However, if any other KDE applications were open before changing the display scaling, they are still blurry. Logging out and in will fix it. Moving the monitor to a new screen and back will fix it. Till then we have a known Qt bug
Thank you.
Is there a Qt bug report tracking that issue?
Could anyone share link to Qt bug please? I'm also affected, see bug 412118
*** Bug 412118 has been marked as a duplicate of this bug. ***
Also affects the Plasma Mobile session: https://invent.kde.org/teams/plasma-mobile/issues/-/issues/29
I think is https://bugreports.qt.io/browse/QTBUG-78327
*** Bug 442437 has been marked as a duplicate of this bug. ***
bug still valid for plasma 5.25