Bug#1056764: grub-efi-amd64: can't boot with GRUB 2.12~rc1-12

[Jeremy Davis]

Hi Nicolas,

It might be worth double checking you have the latest BIOS/UEFI? If it's 
not the latest, then updating is worth a try IMO.

FWIW I recently updated mine to resolve some (completely unrelated) 
issues on my Lenovo Gen 1 X1 Carbon on Bookworm. With no optical drive 
and no Windows, it initially seemed like a PITA, but ended up pretty easy.

Process went something like this:

- download relevant BIOS/UEFI update ISO specific to your model from
   Lenovo
- extract IMG from ISO (using 'geteltorito' tool in 'genisoimage' pkg)
- write IMG to USB (e.g. using 'dd')
- boot from USB
- update...! :)

If you are already running latest, updating doesn't help, or you want to 
try a workaround, perhaps try disabling UEFI (i.e. disable secure boot 
and enable "legacy BIOS only" mode) and install the non-uefi grub (i.e. 
'grub-pc')?

Good luck.

Cheers,
Jeremy
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