Arch Linux

frenzybiscuit

Member

Registered: 2025-06-29

Posts: 3

Thunderbolt eGPU issues

I'm trying to use a nvidia thunderbolt eGPU and running into issues. When launching plasma with the following command I get an error 255.

export KWIN_DRM_DEVICES=/dev/dri/card2 && /usr/lib/plasma-dbus-run-session-if-needed /usr/bin/startplasma-wayland

On Gentoo, I am able to successfully run this command and launch plasma on the eGPU. On arch, I cannot.

My guess at this point is there is a permission issue and/or kernel issue.

If anyone has any ideas, they are welcome!

frenzybiscuit

Member

Registered: 2025-06-29

Posts: 3

Re: Thunderbolt eGPU issues

Also yes the GPU is detected by the system.

Scimmia

Fellow

Registered: 2012-09-01

Posts: 13,723

Re: Thunderbolt eGPU issues

https://bbs.archlinux.org/viewtopic.php?id=57855

frenzybiscuit

Member

Registered: 2025-06-29

Posts: 3

Re: Thunderbolt eGPU issues

https://bbs.archlinux.org/viewtopic.php?id=57855

https://pastebin.com/raw/jL6aGFRV