My mistake, it sounded like you could switch (i.e. ctrl+alt+f3) from your Reddit post.
I’m afraid my knowledge for the issue is limited here, maybe someone with more experience could jump in? I want to make sure it’s not something simple like needing to run sudo mkinitcpio -P after installing the updated drivers by either logging into a tty terminal or chrooting into your system as you did before.
After a quick search, it seems others have had this issue before with lightdm. An easy test would be to try another login manager like sddm. If you go this route, remember to disable lightdm.service and enable sddm.service via systemctl
Hope that helps!
Edit: Found this post from the distinguished jonathon on the Garuda forum: