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[bug #58379] 'AT_keyboard' module does not work with USB-keyboard (embed

From: B.Toennessen
Subject: [bug #58379] 'AT_keyboard' module does not work with USB-keyboard (embedded kbd-layout in grubx64.efi)
Date: Sat, 16 May 2020 14:43:55 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:76.0) Gecko/20100101 Firefox/76.0


                 Summary: 'AT_keyboard' module does not work with USB-keyboard
(embedded kbd-layout in grubx64.efi)
                 Project: GNU GRUB
            Submitted by: tylerd
            Submitted on: Sat 16 May 2020 06:43:54 PM UTC
                Category: Configuration
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 2.02
         Discussion Lock: Any
         Reproducibility: Every Time
         Planned Release: None



The 'AT_keyboard' module was implemented for changing keyboard-layout, as I
understand the grub manual. I embedded an non-US-keyboard layout in
grubx64.efi bootloader as memdisk with all needed modules and grub.cfg
I am testing in uefi-amd64 with Grub 2.02 & 2.04 (Linux Mint 19.3, Debian 10 &
Manjaro 20):

- terminal_input --append at_keyboard -> both inputs are active
- the embedded kbd-layout just works for my internal notebook 
- the plugged USB-keyboard in my notebook just uses the standard
  console US-keyboard layout
- I tried the the same setting for two PCs with USB-keyboards ->
  just the standard console with US-layout is working, if I change
  'terminal_input at_keyboard' via grub-shell => USB-keyboard is 
  not responding anymore

By the way the USB-keyboards work in UEFI menus and settings without any

It seems 'at_keyboard' has problems with handling USB-keyboards. 


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