[bug #59437] garbled GRUB screen on first boot

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Additional Item Attachment, bug #59437 (project grub):

File name: 20201119_072527.jpgSize:258 KB




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[bug #59437] garbled GRUB screen on first boot

[David Lai]

Follow-up Comment #2, bug #59437 (project grub):

As a followup I've verified that the same problems happen using grub 2.02 (the
latest one thats distributed with centos 8).

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[bug #59437] garbled GRUB screen on first boot

[David Lai]

Follow-up Comment #1, bug #59437 (project grub):

I am seeing a similar problem, It looks like grub doesnt "clear the screen"
before outputting its countdown, etc...

I can hit "Esc" to stop the countdown, but the screen is garbled because grub
is only painting the part of the screen it thinks is changed - leaving the
other stuff thats already on the screen in its place.  scrolling around the
screen using arrow keys does repaint some portions, but its still garbled. 
hitting 'e' to edit the boot line DOES repaint the screen and it shows up
nicely.

Interestingly enough I can get the screen to fully repaint the menu by using
keys 'e' 'Escape' - which means: 1) goto edit mode 2) escape edit mode back to
menu.  So this can be used as a (rather obfuscated) workaround.

I would vote for adding a 'control-L' key to grub to repaint the screen in
interactive mode.  and/or adding an initial "clear screen" when grub first
starts up.

I am enclosing screen shots to further illustrate the problem.  I am seeing
this on Grub 0.97; not tested with grub2.

(file #50278, file #50279, file #50280, file #50281)
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Additional Item Attachment:

File name: grub01.png Size:42 KB


File name: grub03.png Size:27 KB


File name: grub02.png Size:55 KB


File name: grub04.png Size:30 KB




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[bug #59437] garbled GRUB screen on first boot

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 Summary: garbled GRUB screen on first boot
 Project: GNU GRUB
Submitted by: durdin
Submitted on: Tue 10 Nov 2020 06:56:35 AM UTC
Category: Booting
Severity: Major
Priority: 5 - Normal
  Item Group: Hardware-specific
  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:

Affects: Grub version 2.04 (Debian)
Description: After Cold-Booting PC Bios/Uefi screen is displayed correctly,
but when Grub2 is loaded and displays menu the entire screen become garbled
and unreadable. This looks like as a cosmetic problem as in other aspects all
works, you still could change boot parameters or change which entry to boot
etc. Then immediately when Linux is booting (or windows) from this state the
screen is again displaying correctly and text is readable. What is even more
strange, after rebooting the grub is displayed correctly without any
glitches.
Reproducibility: I've tested it on multiple main boards and combinations and
looks like it only occurs when Dell-monitor is connected on my AMD graphics
over DisplayPort cable. Unfortunately I do not have second monitor with DP or
second cable to test if the problem is caused by cable itself, but GRUB is
only one who causes screen to misbehave.
Grub settings are distribution-default, I haven't changed anything.




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