Bug#696827: grub-efi-amd64: Debian Wheezy EFI install locks out access to UEFI

[Colin Watson]

On Thu, Dec 27, 2012 at 11:20:35PM +0200, Lauri Vuojolahti wrote:
> Installin Debian Wheezy to Fujitsu Lifebook AH532 locks out access to UEFI.
> After installing Debian it's not possible to access UEFI during boot up by
> pressing F2. Also boot menu (F12)  shows Debian as the only boot option, this
> makes it impossible to boot livecd, usb stick or anything other than Debian
> installation on the hard drive.
> 
> To be able to access UEFI again I had to open the laptop and short CL1 and CL2
> pins on the motherboard. Then I was able to boot to usb stick containing
> FreeDos and flash the "BIOS". After all that I had access to UEFI settings
> again but booting to Debian installation on the hard drive didn't work anymore.
> To be able to boot to Debian again I started Debian netinstall rescue mode and
> ran dpkg-reconfigure grub-efi-amd64, this made my Debian installation work
> again, but now I'm back to square one without access to UEFI settings or
> ability to boot anything other than Debian.

AFAICS this must be a firmware bug; there should be no way for a Debian
installation to be *able* to do this to correct firmware even if it were
trying (which it isn't).  I suggest contacting your vendor for advice,
since they're in the best position to track this down.

-- 
Colin Watson                                       [cjwatson at debian.org]