the at_keyboard module of GRUB takes control of the keyboard controller
from firmware while the firmware is still running, it should come with a
'There be dragons' disclaimer.

additionally at_keybaord doesn't work if you are using a USB keyboard
and the firmware doesnt provide SMM based PS/2 emulation which is about
100% likely on mondern UEFI

** Changed in: grub2 (Ubuntu)
       Status: Triaged => Won't Fix

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https://bugs.launchpad.net/bugs/1897462

Title:
  GRUB2 freezes after loading at_keyboard

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