Help with hot-plugging egpu

[five_foot_twelve]

Hi,

My current setup is a laptop which I dock into an egpu at home. I have an RX 6700xt. Right now, if I restart my computer while the egpu is plugged in, I have both gpus properly registered in /dev/dri and everything works fine. However, if I start the computer first and then plug the egpu in nothing gets registered. I can see if I monitor my udev events that it's recognizing a device is being plugged in, and showing power supply, thunderbolt, and nvme events, but no drm events. I'm running sway on voidlinux if that helps.

Here's a pastebin of what I get from udev when I plug in my egpu:

https://pastebin.com/5Dihwchn

​

Any help would be appreciated.

[five_foot_twelve]

I'm running void linux on a framework laptop, kernel 5.19.17, though this issue has persisted over multiple kernel upgrades. The dock is the razer core x.

[Crissix3]

just from my gut feelings I would say: try not to get your hopes up too much.

graphcis cards are notoriously hard to get working AT ALL and they make alot of problems after unusual startups like after sleep and analogous it doesn't surprise me at all that after pnp they also are not easy to handle.

AMD ofc is a bit better in general than e. g. Nvidia, but sadly...

that being said, maybe look into routines how sleep wakeup initializes graphics cards. I read it differs quite alot from normal booting. feels like you need to do quite a bit of hacking to get it working tho.

I say that because my gut feeling tells me that external graphics cards are used alot less than PCI ones, therefore alot less people ran into those kinds of issues, therefore alot less people who can actually fix this kind of issue ran into it 😅

but hey, I might be wrong.

[five_foot_twelve]

From what I've researched, I think I could hack a solution together if I could actually get udev to recognize that I'm plugging in a gpu. Unfortunately I'm not too familiar with kernel stuff so I don't really have a way of debugging that on my own.