[Bug 1853735] [NEW] grub2 fails to load with DP1.2 (but not DP1.1)

[Georg Lipps]

Public bug reported:

I observed a very strange behaviour and have not found a solution so
far:

Legacy BIOS
GRUB2 (2.02-2ubuntu8.13)
Nvidia Quadro K420
ASUS PB27U 4k monitor connected via display port

The monitor allows to select DP1.1 (30Hz at 4k) and DP1.2 (60Hz at 4k) via
OSD. With DP1.1 computer boots up normally but it would be required to
later change manually to 60Hz.

With DP1.2 the BIOS messages (POST) are seen, then a short cursor blink
in the left upper corner and the systems halts with a blank screen (I
can exclude that grub continues with the boot up process since I cannot
ping the machine).

I tried:

GRUB_GFXMODE "1024*768*8"

and GRUB_TERMINAl "console"

reinstalling MBR


Always the same picture: DP1.1 no problem, DP1.2 no GRUB.

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: dp fails grub2 loading nvidia

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https://bugs.launchpad.net/bugs/1853735

Title:
  grub2 fails to load with DP1.2 (but not DP1.1)

Status in grub2 package in Ubuntu:
  New

Bug description:
  I observed a very strange behaviour and have not found a solution so
  far:

  Legacy BIOS
  GRUB2 (2.02-2ubuntu8.13)
  Nvidia Quadro K420
  ASUS PB27U 4k monitor connected via display port

  The monitor allows to select DP1.1 (30Hz at 4k) and DP1.2 (60Hz at 4k) via
  OSD. With DP1.1 computer boots up normally but it would be required to
  later change manually to 60Hz.

  With DP1.2 the BIOS messages (POST) are seen, then a short cursor
  blink in the left upper corner and the systems halts with a blank
  screen (I can exclude that grub continues with the boot up process
  since I cannot ping the machine).

  I tried:

  GRUB_GFXMODE "1024*768*8"

  and GRUB_TERMINAl "console"

  reinstalling MBR

  
  Always the same picture: DP1.1 no problem, DP1.2 no GRUB.

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