[Bug 1789164] Re: Grub2 boot line indication out of sync on external monitor

[Karl Kastner]

I press e and edit the boot command, then there is an instant reaction
to the keyboard on all monitors, only the indicator in the main and sub-
menu of grub seem to be affected.

I noticed that the sequence is at the moment slightly different then to
what I originally described: cursor down one time -> indicator moves to
the second line on the laptop but does not react on the external
monitor, cursor down a second time -> indicator moves to the third line
on laptop and on the external monitor as well. The indicator only lags
when the cursor keys have been pressed an odd number of times.

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https://bugs.launchpad.net/bugs/1789164

Title:
  Grub2 boot line indication out of sync on external monitor

Status in grub2 package in Ubuntu:
  New

Bug description:
  The boot line indicator is out of sync on my external monitor
  connected via vga (Philips 241B6Q) with that displayed on my laptop
  (XMG/Clevo W230SS, nVidia GM107M). If I press the cursor down key, the
  indicator moves to the second line on my laptop screen, but not on the
  external monitor. If I press the cursor down key a second time, it
  moves on the laptop to the third line, and on the external monitor to
  the second line. The monitor thus displays the last but one state, so
  that the user frequently selects the wrong boot item. A screen shot is
  attached. This also happens in combination with other external
  monitors, so it is most likely a bug in the graphics system.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: grub2 (not installed)
  ProcVersionSignature: Ubuntu 4.13.0-43.48-generic 4.13.16
  Uname: Linux 4.13.0-43-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.3
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Mon Aug 27 08:12:16 2018
  InstallationDate: Installed on 2015-11-05 (1025 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  SourcePackage: grub2
  UpgradeStatus: Upgraded to bionic on 2018-05-24 (94 days ago)

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