Hi there,
After updating my debian 13 last week-end, when I restart my computer,
it launches GRUB as usual, but immediately reboots after GRUB had just
the time to display a first line, but not even the menuentries.
Therefore, I was not able to log in into my debian because it reboots at
infinity.
I found this:
### BEGIN /etc/grub.d/30_uefi-firmware ###
if [ "$grub_platform" = "efi" ]; then
fwsetup --is-supported
if [ "$?" = 0 ]; then
menuentry 'UEFI Firmware Settings' $menuentry_id_option 'uefi-firmware' {
fwsetup
}
fi
fi
### END /etc/grub.d/30_uefi-firmware ###
to be the cause of the problem, and since from my point of view these
lines seem to be correct, I asked Claude.IA which answered:
************
Look closely at the block: the |fwsetup --is-supported| test is placed
*outside* any |menuentry|. So it runs automatically, unconditionally, as
soon as GRUB loads |grub.cfg| — before the menu is even displayed,
regardless of which entry would be selected.
This command queries an EFI variable (|OsIndicationsSupported|) to check
whether the firmware supports rebooting directly into its configuration
interface. This is a fairly common UEFI bug (seen on some Dell, HP,
Lenovo, ASUS firmwares...): this simple |GetVariable| query causes the
firmware to crash, which responds by forcing an immediate reset of the
machine. Hence the exact symptom you're describing: a single line of
GRUB output, then an instant reboot — well before the menu has any
chance to appear.
*************
As a conclusion fwsetup --is-supported should not be used as it is in
/etc/grub.d/30_uefi-firmware: as for my case, it is may produce an
infinite BIOS reboot for a lot of users.
I just wanted to report this somewhere, and as I was not able to do it
with reportbug, I finally decided to post it on this list.
Regards,
Nicolas
