At first, I thought it might be some hardware issue like that. But it really is macOS shutting itself down after 500 ms of inactivity. Some kind of trigger related to the liquid contact indicator is my best guess.

Back when I switched to Linux, I still hadn’t taped down the fn key. That’s how I realized my laptop was actually fine, even without any key taped down. It runs better on Arch than on Mojave, too. If I ended up taping down the fn key, it’s only because I still need to use macOS from time to time.

But that’s okay, I can live without the fn key! And now that I can use my internal keyboard while running Linux, it’s gonna be all good. Thanks. c:

You really did! Thank you again. c:

Using an external keyboard does work, even without disabling the internal one, but the goal really was to be able to use my laptop as a laptop again. c:

All good now! Thank you so much though, I appreciate the attention. c:

Oh my gosh! It worked! It totally worked! You’re awesome! Thank you so, so much!

To disable the fn key temporarily:
echo 0 | sudo tee /sys/module/hid_apple/parameters/fnmode

To disable the fn key permanently:
echo options hid_apple fnmode=0 | sudo tee -a /etc/modprobe.d/hid_apple.conf

And then regenerate the initramfs. If you’re using Arch like me, it’s:
sudo mkinitcpio -P

Being once again able to use my laptop while resting my back will make life much better.

Thank you to infinity and beyond! Blåhaj bless you. <3

With the fn key taped down, I’m sadly unable to do fn+enter or fn+backspace. However, fn never shows up with sudo keyd monitor, sudo evtest, or xev. I’ve just tried setting fn to insert (enter) and delete (backspace) via keyd, but no luck there either. :c

Haha, I even use Emacs too. :)

It’s a pretty long output. Maybe hid_apple or mac_hid? But I’m unsure what most of those are, hence why I included them all, sorry about that.