[bug #60727] Input lost after switching terminal_input to at_keyboard (can't switch to dvorak layout)

[Andrew]

URL:
  <https://savannah.gnu.org/bugs/?60727>

                 Summary: Input lost after switching terminal_input to
at_keyboard (can't switch to dvorak layout)
                 Project: GNU GRUB
            Submitted by: bircoph
            Submitted on: Fri 04 Jun 2021 11:03:19 AM UTC
                Category: Terminal
                Severity: Major
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 
                 Release: other
         Discussion Lock: Any
         Reproducibility: Every Time
         Planned Release: None

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Details:

Hi!

I use grub-2.06_rc1 on Gentoo ~x86. My hardware is AT keyboard (AT Translated
Set 2 keyboard built-in in my laptop). This is important, because there are
very similar bugs that were closed because reporters used usb keyboard:
bug #51129
bug #50232

I want to use dvorak layout. In order to do this I use the following in my
grub config:

insmod keylayouts
keymap /boot/grub/dvorak.gkb
terminal_input at_keyboard

It should work, but it doesn't. (dvorak.gkb is generated using grub-mklayout)

I tried outb magic from Debian bug 741464:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=741464
mentioned in bug #50232:

terminal_input at_keyboard ; outb 0x64 0x60 ; outb 0x60 0x40 0x40

and this one:

terminal_input at_keyboard ; outb 0x64 0x60 ; outb 0x60 0x64

Both don't help, neither in config nor in interactive run-time grub shell.

With grub-2 I always had problem with switching to dvorak layout, but with
2.04-r1 the following hack worked:

insmod terminal
insmod at_keyboard
terminal_input console
terminal_output console
insmod keylayouts
keymap /boot/grub/dvorak.gkb

# the last line in config after all menu entries
terminal_input --append at_keyboard

It is importand that at_keyboard was added after all menu entries. Have no
idea why.

This workaround no longer works in 2.06_rc1, but it gave me an insight what to
try.

If I switch to the grub run-time built-in shell and try to append at_keyboard
first and remove console later, it works. So, if I have the following in the
config (or enter interactively):

insmod keylayouts
keymap /boot/grub/dvorak.gkb

and then enter interactively in the grub run-time shell:

terminal_input --append at_keyboard
terminal_input --remove console

Then I can finally use the dvorak layout.

It looks like a bug to me that

terminal_input at_keyboard

doesn't work (it leads to lost input at all), but:

terminal_input --append at_keyboard
terminal_input --remove console

works. They should do the same, but they are not.

Without '--remove console' it appears that both drivers are active and both
try to process input, which leads to broken input. E.g. if I press and hold
's' qwerty key which means 'o' in dvorak layout, I have an input line like
this one:

oooooosoooossoooooooosooooooooooooooossoooooooosoooooosooooooooooooooooossoooooooooosoooosoooo

This makes input unusable, especially for passwords where no visible input
correction is possible.

Furthermore the workaround above does *not* work if put in the grub config
file. I have no idea why. I tried to add a sleep between these 2 commands in
the config file, because there is 1-2 seconds delay at runtime when I run
'terminal_input --append at_keyboard':

terminal_input --append at_keyboard
sleep --verbose 5
terminal_input --remove console

but this doesn't help. However, I see that the sleep happens before menu is
shown even if I put the snippet shown above in the end of the config file.

Please fix switching to at_keyboard so that dvorak users may enjoy their
favorite layout.





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