Bug#1025477: grub2: Regression when updating from grub2 2.06-5 to 2.06-5 breaks GRUB_GFXMODE

[Konomi Kitten]

Source: grub2
Version: 2.06-6
Severity: important
X-Debbugs-Cc: konomikitten at gmail.com

Dear Maintainer,

I'm reporting against the source package because I am unsure which specific
package of grub2 has caused this bug.

After updating to version 2.06-6 my GRUB_GFXMODE line in /etc/default/grub no
longer works. I get the following two errors displayed when grub2 first starts:

Welcome to GRUB!

error: no server is specified.
error: no suitable video mode found.

After this I am greeted with an extremely low resolution grub screen but the
computer is still able to boot.

Downgrading the following packages fixes the issue:

Start-Date: 2022-12-05  22:52:19
Commandline: apt install ./grub2-common_2.06-5_amd64.deb ./grub-
common_2.06-5_amd64.deb ./grub-efi_2.06-5_amd64.deb ./grub-efi-
amd64_2.06-5_amd64.deb ./grub-efi-amd64-bin_2.06-5_amd64.deb ./grub-pc-
bin_2.06-5_amd64.deb
Requested-By: debian (1000)
Downgrade: grub-pc-bin:amd64 (2.06-6, 2.06-5), grub-efi-amd64:amd64 (2.06-6,
2.06-5), grub-efi-amd64-bin:amd64 (2.06-6, 2.06-5), grub2-common:amd64 (2.06-6,
2.06-5), grub-common:amd64 (2.06-6, 2.06-5), grub-efi:amd64 (2.06-6, 2.06-5)
End-Date: 2022-12-05  22:52:26


-- System Information:
Debian Release: bookworm/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.18.0-4-amd64 (SMP w/12 CPU threads; PREEMPT)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8), LANGUAGE=en_AU:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled