eGPU killing computer (shutdown) and starts boot loop
I have run into a super weird bug recently on my Windows side (and yes, for those who have seen my other post, it means the eGPU isn't work for either linux or windows for me :'(. At first on Windows everything was working fairly well, but my computer would freeze every so often and I would have to force a restart. I unplugged my eGPU for a few days and it was still happening, so reading other people's advice, it seemed to be the Intel Panel Refresh in the Intel Graphics Power Saving settings. I made this change and Updated Windows. But now, any time the eGPU is plugged in, the computer is immediately force-shuts down, like someone power cycled it or force killed the OS/kernel, and reboots, but then gets into a power-down boot loop. At first I thought it was some weird power supply thing, so I plugged it in with the original Dell power supply also plugged in, but that didn't help. The only other thing I did between then and now was add an additional M.2 SSD to the laptop, but I am confident that this isn't related to that because the Ubuntu system boots just fine with the eGPU plugged in (even though it still doesn't recognize my GPU or anything plugged into there).
Has anyone seen this before?
I experienced the issue similar to that which you described with my build, XPS 13 7390 + R43SG + JEYI LEIDIAN (TB3). After a few minutes of light usage but never during heavy loads, my computer would freeze. If I was listening to audio it would buzz and I would have to force a restart. I fixed this issue by turning off link state power management (LSPM) in the PCI Express settings in Power Options. When LSPM is on the default "maximum power savings" and a TB3 connection is not transferring any/much data (as mine was not during light usage), the connection with that device is turned off entirely, causing the freeze. I'm not sure if LSPM relates to your issue but I hope this helps.