Re: UEFI GRUB boot menu disappears after booting into Windows 8

[Joan Jerez]

> In the followup message you said you cannot interrupt booting into
> Windows. Here you say "change booting method to Legacy" which implies
> you *can* interrupt booting and go into firmware setup. Could you
> clarify?
No, I need to shut down computer to access firmware setup, then I press 
an alternate button that powers up computer and goes directly to 
firmware setup.

Anyway, I solved the issue experimenting, finally :)
But I learned from this messages how UEFI works.

EFI partition is /dev/sda3 actually... (/dev/sda1 is for recovery 
purposes, and it doesn't have boot flag) so I copied GRUB EFI 
application and I replaced EFI/Boot/bootx64.efi and 
EFI/Microsoft/Boot/bootmgfw.efi...
before, I moved EFI/Microsoft/Boot/bootmgfw.efi to 
/EFI/Microsoft/bootmgfw.efi, and I updated Windows grub entry to reflect 
changes.

Now, I can dualboot without problems. Experimenting with efibootmgr 
didn't work, firmware misses boot order (maybe is what happened to me) 
-ubuntu /EFI/ubuntu/grubx64.efi was configured to be first- and it 
doesn't remember what boot entries are active or deactivated (upon reboot).

Al 14/01/13 03:33, En/na Andrey Borzenkov ha escrit:
> В Sun, 13 Jan 2013 21:24:44 +0100
> Joan Jerez <address@hidden> пишет:
>
> > Hello,
> >
> > After 6 January of 2013, I started to get problems when I boot into
> > Windows 8, and upon restart or shutdown, GRUB disappears and it boots
> > directly into Windows.
> >
> > I tried to remove (moving to another place) EFI applications related to
> > Microsoft (after installing Ubuntu, they are named bootmgfw.efi.bkp and
> > bootx64.efi.bkp) to ensure that they are not interfere with booting. As
> > far I can remember they are in /boot/efi/EFI/Boot and
> > /boot/efi/EFI/Microsoft/Boot/, now these folders are populated by GRUB2
> > EFI applications.
> >
> > The problem isn't solved by doing so, so UEFI firmware is not escaping
> > GRUB and booting directly using MS bootloader.
> > Curiously, a long workaround is change booting method from UEFI to
> > Legacy, boot to a CD/DVD, or USB, shutdown, and change it again to UEFI,
> > and GRUB miraculously appears again.
> In the followup message you said you cannot interrupt booting into
> Windows. Here you say "change booting method to Legacy" which implies
> you *can* interrupt booting and go into firmware setup. Could you
> clarify?
>
> If you *can* interrupt booting and go into firmware setup at this point
> - how does UEFI boot menu look like? Does it have entries for Linux?
>
> Does you system offer possibility to run EFI shell?