I have a pretty severe issue with KDE Plasma on Fedora 35.
I have a laptop with 3 external screens connected. The laptop lid is closed (in case this is relevant) 2 of them are 4k monitors that I use at 2k resolution and is a 1080p monitor.
When being connected to that docking station I have typically 1 of two cases:
- The taskbar on my main screen is missing and I have good FPS
- The taskbar on all screens are present but I have around 0.25-0.5 FPS for windows (the cursor moves smoothly but all applications only update around once every 2-4 seconds. Also applies to moving around windows and resizing them)
A little while back I found out that you can restart KDE with this command:
killall plasmashell; kwin --replace & kstart plasmashell > /dev/null 2>&1 & disown
Now with diconnecting and reconnecting my docking station and running this command, typically eventually I get a state where I have all my taskbars and decent FPS, however when this happens the background of one of the 3 screens is blank and rightclicking it brings up no context menu like with the others.
I already tried completely resetting my config by deleting all file that match
~/.config/plasma*. This made no difference.
Also this sadly isn't a clean instalaltion of Fedora 35, but one that was upgraded over time from Fedora 31. Though this issue began only during Fedora 35. Initially after the upgrade everything was fine. Then I had to leave the office for a few months and when I came back the lags happened, and all the while all I really did was keeping up with updates.
I'm really at a loss here. Additionally I can't just reinstall the machine for various reasons I'd really not like to get into here. I also tried Wayland, but that doesn't detect my external screens properly, so it's no use for me at the moment.
- KDE-Plasma: 5.24.4
- KDE-Frameworks: 5.91.0
- Qt: 5.15.2
- Kernel: 5.18.11-100.fc35.x86_64
- Graphics Platform: X11
Here is my graphics cards info:
sudo lshw -c video *-display description: VGA compatible controller product: WhiskeyLake-U GT2 [UHD Graphics 620] vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 version: 02 width: 64 bits clock: 33MHz capabilities: pciexpress msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0 resources: irq:138 memory:d7000000-d7ffffff memory:b0000000-bfffffff ioport:3000(size=64) memory:c0000-dffff