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Re: Halt command in UEFI reboots.

From: Goh Lip
Subject: Re: Halt command in UEFI reboots.
Date: Sat, 2 Jan 2016 22:17:56 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.0

On 02/01/2016 01:53, Goh Lip wrote:

On 02/01/16 01:35, Andrei Borzenkov wrote:
01.01.2016 19:46, Goh Lip пишет:
Issuing "halt" command in grub prompt reboots the computer instead of
shutting down completely. This happens only in UEFI systems and not in
bios-legacy which works as it should. Computer does power down but
restarts again.

Is there another command that I should use?

GRUB tries to find out correct ACPI value for power-off and calls ACPI.
It is possible that GRUB fails to parse ACPI tables, it is possible that
ACPI tables are not correct, it is possible that firmware misbehaves.

More debugging is needed; are you willing to install current development
version and assist in debugging?

How can I help?
Assuming of course I am capable.

Downloaded your latest current development version of grub-mkrescue (2.02 beta2), burned to cd and booted to grub prompt. Typed in "halt" at prompt, with same results - system powers down and restarts again.

This happens with all the following grub versions -

Kubuntu Xenial - 2.02-beta2-32ubuntu1
Kubuntu Wily   - 2.02-beta2-29ubuntu0.2
Manjaro testing- 2.02-beta2-14
KaOS    testing- 2.01.81-1                [*]

If this does not happen with your system, perhaps then it is a bios firmware problem at my end? If this is so, then I am satisfied that grub 2 is working properly. A confirmation (that it works at your end) will be good. A suggestion on how to update my firmware [**] will be better.


[*] - KaOS default installation comes with bootctl (systemd bootloader)
but can be made to install with grub 2 by installing efivars and
efibootmgr at install media and adding /boot/efi instead of
/boot as mount point in ESP.

[**] - Machine: Mobo: ASUSTeK model: P8B75-V v: Rev X.0x
Bios: American Megatrends v: 0414 date: 04/24/2012

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