UE5 on Linux is glitchy and freeze randomly, unusable!

[Deewens]

Hello,

I am trying to use UE5 on Linux, so I downloaded the Linux build and extracted the files in my Home folder.
I opened the Engine and created a new project. First thing first, UE5 is really weird on KDE Plasma DE.
When I hover on stuff inside the UE editor, the tool tip appears immediately. Which is kind of annoying because it hides what is below the UI, and it is really disturbing. The tooltip should appear after a small amount of time hovering, which is not the case in KDE Plasma. This seems related to KDE because I did not have this problem with GNOME.

Secondly, and this is an issue with Linux in general, the UI is really glitchy. Whenever I move a Window on top of the editor (even a window from the editor itself), this window is copying itself multiple times. Also, the Editor is freezing regularly and randomly, even though my GPU usage is low and memory too.

Check the video below, you can also see the freeze when I am just moving my cursor on top of the editor.

Just so you know, I tried in Pop!_OS (GNOME) and Manjaro (KDE Plasma). Same issues on both (except for the tooltip appearance time). I am working on a laptop with hybrid graphics, using NVIDIA proprietary drivers.

On this same computer, I am also running Unreal on Windows, which works fine (at least, to the capacity of my laptop). It is running horribly bad on Linux though.

What could be the issue? Is it a bug with UE on Linux?

Thanks!

Hardware:
CPU: Intel Core I7 9750H
RAM: 32 GB DDR4
GPU: GeForce GTX 1660 Ti
Storage: SSD NVME

[Deewens]

up. After investigating, the tooltip ‘issue’ happens also in GNOME.

[Deewens]

The tooltip issue can be fixed by increasing the delay for them to appear (or even deactivate them, but they are still useful).

Engine/Config/ConsoleVariables.ini (To make it permanent)
Slate.EnableTooltips=1
Slate.TooltipSummonDelay=1

Console:
Slate.EnableTooltips 1
Slate.TooltipSummonDelay 1

As for the graphical glitches when moving windows on top of the editor, it only happens on Plasma. So if you want to use Unreal without these glitches, you will have to use GNOME or Cinnamon or I think another GTK-based desktop environment would work.

On X11, there are still some bugs, where the mousse behave weirdly. This can be fixed by adding the -nohighdpi argument when starting the Editor.

For the editor freeze, this is probably due to my GPU being too old for the Vulkan renderer that is used on Linux (I does not have this issue on Windows, but DirectX does not needs that much VRAM compared to Vulkan). It is quite annoying, but now that I fixed almost every issue, the engine is still pretty much usable on my laptop with linux.