Now I am using KDE and meeting similar problems here, so I want to switch to modesetting, but I searched in Archwiki and found no instructions on installation and settings. Could someone help me?
Hey @Firestar
Looks like you are already using modesetting. I think you’re dealing with 2 separate things: 1. glitchy desktop objects and 2. improper display resolution for your custom desktop.
Things to try, in my opinion:
See if switching the driver to video-modesetting makes any difference. The easiest way to do this is on the GUI (Manjaro Settings → Hardware Configuration)
You might want to play around with your KDE desktop resolution. If you’re not able to achieve the desired outcome with any of the predefined resolution values in KDE, you might want to create a custom mode using a combination of cvt / xrandr and making it persistent via xorg.conf. The link below shows how to do this (from Arch Wiki):
The missing icons might be an issue with your theme. I don’t think the breath themes were updated with all icons required for Plasma 5.21. Try the Breeze Plasma theme.
Both theme lost icons for Electron and SAOImageDS9, many icons hopping with the cursor when I open an app it becomes the default “triangle in a box” icon.
video-linux displays better than video-modesetting
On video-modesetting, the windows and icons displayed in a smaller mode (some of the icons are different) although I have a x200% screen. Yakuake also displays like this:
You should start explaining what steps you have done so far.
See if you can get into your desktop by switching TTYs or starting it manually.
Modes created with Xrandr are not persistent unless you make them so in a configuration file. Rolling back the configuration changes and restarting should be good.
I can switch tty. I tried to configure them in MHWD (like reinstalling video-modesetting and video-linux) but failed. Sorry I have deleted and reinstalled Manjaro.