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

[RussianNeuroMancer]

> Under UEFI, there is no way for grub to detect a modifier key being held down; instead of holding shift at boot to get to the menu, you have to press the shift key at the right moment.
> And you will never reliably get the boot menu.

Press Esc when GRUB2 gray screen appear is reliable way to get into
menu, I just tested this on three devices around half-hundred times in
total. Somehow it works with version 2.02+dfsg1-5ubuntu8 and no longer
works with 2.02+dfsg1-5ubuntu8.2. Why is that?

> If you have a boot timeout of 0, that means grub waits 0 seconds for you to press the shift key before booting.
> That means the window in which you can press the shift key to get to the boot menu is 0 seconds.

If I read systemd-analyze report right, version 2.02+dfsg1-5ubuntu8 wait three seconds for user input, even if grub config contain:
GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=0
GRUB_RECORDFAIL_TIMEOUT=0

Meanwhile 2.02+dfsg1-5ubuntu8.2 doesn't wait for user input and indeed
behave like you described - where this difference between
2.02+dfsg1-5ubuntu8 and 2.02+dfsg1-5ubuntu8.2 came from?

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to grub2 in Ubuntu.
https://bugs.launchpad.net/bugs/1815002

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

Status in grub2 package in Ubuntu:
  Opinion

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1815002/+subscriptions