[Bug 1815002] Re: quick-boot-lvm.patch caused regression - menu always appear if root is on Btrfs

[RussianNeuroMancer]

> Nevertheless, this configuration does NOT reliably allow the user to
reach the boot menu with the default timeout of 0.

Could you please clarify under which circumstances this configuration
does not reliably allow user reach boot menu? I asking because I never
seen situation where this menu wasn't reachable on dozens/hundreds
different devices with / on btrfs, from 7 inch tablets to two-socket
servers.

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Title:
  quick-boot-lvm.patch caused regression - menu always appear if root is
  on Btrfs

Status in grub2 package in Ubuntu:
  Invalid

Bug description:
  Comments about this regression:

  https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1800722/comments/12
  https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1800722/comments/13

  In my case menu starting to always appear on various devices from
  small tablets to workstations. First time it happened with laptop
  https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/736743/comments/95
  and since then more devices became affected. I not 100% sure, but
  seems like at least one unsuccessfully boot is required to reproduce
  this issue, but maybe I am mistake here and issue starting to happen
  for all Btrfs users.

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