Created attachment 114328 [details] when display scaling factor is 1.2 See the screenshots. I can reproduce easily maximizing/unmaximizing the desktop settings window some times in sequence. Arch Linux Plasma 5.13.4 frameworks 5.48 Qt 5.11.1
Created attachment 114329 [details] no change in display scaling factor
Both look pretty broken X or wayland?
X11. I have never seen this bug under Wayland.
Same bug in plasma 5.14 beta.
Now I see the same bug on Wayland after change fonts DPI to 120. Operating System: Arch Linux KDE Plasma Version: 5.14.1 Qt Version: 5.12.0 beta2 KDE Frameworks Version: 5.51.0
*** Bug 401492 has been marked as a duplicate of this bug. ***
The only workaround I could find so far for this issue is using xorg's intel driver (instead of kernel's) and enable uxa instead of sna as accelmethod (in /etc/X11/xorg.conf.d/20-intel.conf): Section "Device" Identifier "Intel Graphics" Driver "intel" Option "AccelMethod" "uxa" EndSection
It's still happening on X11 even when fractional display scaling is not used. Operating System: Arch Linux KDE Plasma Version: 5.15.1 KDE Frameworks Version: 5.55.0 Qt Version: 5.12.1 Kernel Version: 4.20.11-arch2-1-ARCH
I also get this bug since I switched from intel driver to modesettings driver for X11. Doesn't this imply the bug is in the modesettings driver?
On my system the problem is even worse when I use intel driver instead of modesetting driver. Operating System: Arch Linux KDE Plasma Version: 5.15.4 KDE Frameworks Version: 5.57.0 Qt Version: 5.12.2 Kernel Version: 5.0.7-arch1-1-ARCH
(In reply to avlas from comment #7) > The only workaround I could find so far for this issue is using xorg's intel > driver (instead of kernel's) and enable uxa instead of sna as accelmethod Another one confirmed this: https://www.reddit.com/r/kde/comments/c5taoz/does_anyone_know_how_to_get_rid_of_this_bug/es6hmk2?utm_source=share&utm_medium=web2x
*** Bug 411977 has been marked as a duplicate of this bug. ***
Tried uxa with the Intel driver (using both DRI 2 and 3), problem persists on a HD 4400
*** Bug 414989 has been marked as a duplicate of this bug. ***
I have finally found a workaround, if you enable the FPS counter effect the bug is gone while the effect is active. Btw if you want to trigger the bug in the first place you have to trigger a GPU workload, this is easy to do with a GPU benchmark tool, I use Unigine heaven for testing, once the benchmark is running, open any window and move it around, the bug is triggered every time. Having the FPS counter effect enabled prevent the glitch from appearing. I'm using the modesetting driver, i haven't tested it with the Intel driver yet.
Created attachment 125502 [details] screenshot of Plasma 5.18 beta Operating System: Arch Linux KDE Plasma Version: 5.17.90 KDE Frameworks Version: 5.66.0 Qt Version: 5.14.1
*** Bug 413084 has been marked as a duplicate of this bug. ***
*** Bug 426831 has been marked as a duplicate of this bug. ***