On February 15, 2019 4:08:36 AM PST, RussianNeuroMancer <1815...@bugs.launchpad.net> wrote: >> 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. > >-- >You received this bug notification because you are subscribed to >Ubuntu. >Matching subscriptions: regression tagged >https://bugs.launchpad.net/bugs/1815002 > >Title: > quick-boot-lvm.patch caused regression - menu always appear if root is > on Btrfs > >To manage notifications about this bug go to: >https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1815002/+subscriptions
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. 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 you miss the window, your only option is to reboot and try again. If you reboot before the boot finishes, then grub will show you the boot menu by default with a timeout. But if /boot is on btrfs, then grub has no way to record that a boot was attempted, which means it will not know that you rebooted before the boot finished. And you will never reliably get the boot menu. -- Steve Langasek -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1815002 Title: quick-boot-lvm.patch caused regression - menu always appear if root is on Btrfs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1815002/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
