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[Launchpad Bug Tracker <1734278@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package grub2-signed - 1.85.1

---------------
grub2-signed (1.85.1) artful; urgency=medium

  * Rebuild against grub2 2.02~beta3-4ubuntu7.1. (LP: #1734278,
#1708245)

 -- Mathieu Trudel-Lapierre <cyphermox@xxxxxxxxxx>  Wed, 13 Dec 2017
14:36:57 -0500

** Changed in: grub2-signed (Ubuntu Artful)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1734278

Title:
  Grub2 cannot boot up when 8254 time function disable

Status in HWE Next:
  Triaged
Status in OEM Priority Project:
  Fix Released
Status in debian-installer package in Ubuntu:
  Fix Released
Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2-signed package in Ubuntu:
  Fix Released
Status in debian-installer source package in Xenial:
  Fix Released
Status in grub2 source package in Xenial:
  Fix Released
Status in grub2-signed source package in Xenial:
  New
Status in debian-installer source package in Artful:
  New
Status in grub2 source package in Artful:
  Fix Committed
Status in grub2-signed source package in Artful:
  Fix Released
Status in debian-installer source package in Bionic:
  Fix Released
Status in grub2 source package in Bionic:
  Fix Released
Status in grub2-signed source package in Bionic:
  Fix Released
Status in grub2 package in Debian:
  New
Status in grub2 package in Fedora:
  Fix Committed

Bug description:
  [Impact]
  Some Intel SoC-based systems.

  [Test cases]
  1) Boot an affected system.

  [Regression potential]
  Some systems may rely on the current state of the timer selection in order to be able to boot successfully, or to catch key presses before the end of a timeout in the menu.
  These systems may then fail to boot correctly, stuck in a timeout of crashing in grub. The new default, pmtimer, should be available on all ACPI-capable systems without being power-gated such as for the PIT, so the impact of this possible regression is minimal.

  ---

  Fail to boot into Ubuntu GRUB on the platforms which legacy(8254) timer function is disabled.
  "8254 clock gating" is provided to disable 8254 timer to get rid of legacy and save power. The platforms with the firmware which disable the 8254 timer will fail to boot up and block on grub2 which uses the 8254 timer to calibrate the TSC.

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