Arc support was added after release to Linux Kernel 6.2 and it’s steadily improved since. Older Linux distros, or “LTS” oriented distros that favour stability may still not have support for them. I know Unraid was very slow to pick up on it and I had to settle for passing the pcie device through to a VM to get it working. Intel is keen to made these viable though, and I love having the AV1 encoder from my A380.

That one sounds squarely on Nvidia. Any driver that uses undocumented workarounds to gain kernel level access or utilizes an access loophool for system hooks is a bad driver. I’d assume Debian, or likely more accurately the Linux kernel itself was updated following some matter of CVE that Nvidia was quietly abusing.

Frustrating, but a good example of why those kinds of proprietary drivers are such a nightmare. You really just don’t know what techniques they’re using.

Biggest difference is that wormhole will pass traffic between devices on different networks as long as both are routable. So it’s not limited to a local network connection.