I updated my Linux machine yesterday (switched to unstable NixOS branch).
Very worried to ask what happens when u-boot starts rapidly spamming “Resetting EP 2” before stopping and then slowly spamming “XHCI timeout on event type 0”, but when I restarted thats what it started doing. “no biggie”, I thought; I’ll just update m1n1, since I forgot to do that and that was probably the issue. Then it persisted, and then one magical instance it didn’t, without me changing anything. So I carried on with my day thinking it had sorted itself out and my computer was not in fact bricked.
So imagine my excitement when it starts doing it again today. At first its consistently failing in the exact same way every time I try and boot into my computer, and then I try to unplug all my USB devices to see if it helps, it starts working again, so I plug all them back in and it continues working. So I again haven’t actually changed anything and I am nowhere closer to understanding what’s actually going on.
I think it might have something to do with my external SSD, but it wasn’t doing that before and I was near certain that bug was fixed. But again its too inconsistent to really tell. The only alternatives I can think of though are my keyboard, my tablet, or the number of devices I have plugged in (9).
I figured I’d come here first since it seems to be a problem with u-boot and possibly the USB controller, but if you think it’s more likely an issue on the NixOS’s end I can file an issue on the nixos-apple-silicon repo.
Any idea on how I even debug a problem like this?
