Huh, when did this happen? I thought external display was still not supported on MacBook air m1s?

Ed: according to

https://asahilinux.org/docs/platform/feature-support/m1/#soc...

MacBook air still have no external display support?

I imagine this is actually a usb-c issue rather than straight-up no display support

So, you are not running Linux on a MacBook air m1, I take it - when you say it works fine for you?