[Bug 1753837] Re: GRUB_GFXMODE no longer supports high resolution since upgrading to 2.02~beta3-4ubuntu7.2

Gargoyle g at rgoyle.com
Wed Mar 7 08:20:04 UTC 2018


*** This bug is a duplicate of bug 1752767 ***
    https://bugs.launchpad.net/bugs/1752767

The fix for removing the "--append" flag in
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1752767 also fixes
this.

I removed the flag from /etc/grub.d/00_header and updated and on the
next reboot, grub was happily running at 2560x1440 (and with a
background image).


** This bug has been marked a duplicate of bug 1752767
   grub2 regression, simultaneous console and video graphical glitches with new patch

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https://bugs.launchpad.net/bugs/1753837

Title:
  GRUB_GFXMODE no longer supports high resolution since upgrading to
  2.02~beta3-4ubuntu7.2

Status in grub2 package in Ubuntu:
  New

Bug description:
  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 card.

  
  ➜  ~ apt-cache policy grub-efi-amd64
  grub-efi-amd64:
    Installed: 2.02~beta3-4ubuntu7.2
    Candidate: 2.02~beta3-4ubuntu7.2
    Version table:
   *** 2.02~beta3-4ubuntu7.2 500
          500 http://gb.archive.ubuntu.com/ubuntu artful-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       2.02~beta3-4ubuntu7 500
          500 http://gb.archive.ubuntu.com/ubuntu 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_DEFAULT=saved
  GRUB_SAVEDEFAULT=true
  #GRUB_HIDDEN_TIMEOUT=0
  #GRUB_HIDDEN_TIMEOUT_QUIET=true
  GRUB_TIMEOUT=10
  GRUB_TIMEOUT_STYLE=menu
  GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
  GRUB_CMDLINE_LINUX=""

  # 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 ...)
  #GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

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

  # 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'
  GRUB_GFXMODE=1024x768
  GRUB_BACKGROUND="/boot/grub/grub_background.png"

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

  # Uncomment to disable generation of recovery mode menu entries
  #GRUB_DISABLE_RECOVERY="true"

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

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