Public bug reported:

For months, my EFI grub has been happy to accept GRUB_GFXMODE=2560x1440
(my monitor native resolution).

However, since the recent update to 2.02~beta3-4ubuntu7.2, all I get is
a < 1s flash of the high resolution version (with background image) then
it falls back to white on grey.

If I comment out the GRUB_GFXMODE and GRUB_BACKGROUND lines, and
"update-grub", I get a low resolution version with the background image
still in place, and some flickering text artefacts.

With the config as show below with GRUB_GFXMODE=1024x768 and
GRUB_BACKGROUND="..." I get a working grub, although at a lower
resolution which looks a bit crappy.

Although this might seem a fairly trivial bug in terms of actual impact,
I do have a dual boot machine and I hop between Linux and Windows a few
times a day, and I like it when grub looks nice and crisp.

System is an AMD Ryzen 1800X, Hero Vi Motherboard and Nvidia 1080Ti GFX

➜  ~ apt-cache policy grub-efi-amd64
  Installed: 2.02~beta3-4ubuntu7.2
  Candidate: 2.02~beta3-4ubuntu7.2
  Version table:
 *** 2.02~beta3-4ubuntu7.2 500
        500 artful-updates/main amd64 
        100 /var/lib/dpkg/status
     2.02~beta3-4ubuntu7 500
        500 artful/main amd64 Packages

➜  ~ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 17.10
Release:        17.10
Codename:       artful

➜  ~ cat /etc/default/grub 
        # If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)

# Uncomment to disable graphical terminal (grub-pc only)

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux

# Uncomment to disable generation of recovery mode menu entries

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

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

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  GRUB_GFXMODE no longer supports high resolution since upgrading to

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