[Bug 1734278] [grub2/artful] possible regression found

[Ubuntu Foundations Team Bug Bot]

As a part of the Stable Release Updates quality process a search for
Launchpad bug reports using the version of grub2 from artful-proposed
was performed and bug 1745221 was found.  Please investigate this bug
report to ensure that a regression will not be created by this SRU. In
the event that this is not a regression remove the "verification-failed"
tag from this bug report and add the tag "bot-stop-nagging" to bug
1745221 (not this bug). Thanks!

** Tags added: verification-failed

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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 Committed
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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