linux-kernel - Re: halt does not shut the system down

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Date:	Wed, 10 Oct 2007 11:56:13 +0200
From:	John Sigler <linux.kernel@...e.fr>
To:	Remy Bohmer <linux@...mer.net>
CC:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	robert.moore@...el.com, len.brown@...el.com
Subject: Re: halt does not shut the system down

Hello Remy,

Remy Bohmer wrote:

> John Sigler wrote:
> 
>> When I run 'halt' the kernel prints:
>> Halting.
>> Shutdown: hdc
>> ACPI: PCI interrupt for device 0000:01:05.0 disabled
>> ACPI: PCI interrupt for device 0000:01:04.0 disabled
>> ACPI: PCI interrupt for device 0000:01:03.0 disabled
>> ACPI: PCI interrupt for device 0000:01:02.0 disabled
>> Power down.
>> acpi_power_off called
>>
>> But the system does not shut down. (The fans keep spinning, the LEDs
> 
> I have seen this behavior earlier on a system with the SMI interrupt
> disabled. I do not know if this the case here, it is just a hint.

Thanks for the suggestion. I didn't see anything related to SMM in the 
BIOS menus. However, the system has real-time constraints. Thus, I'd 
turn SMM off if I knew how :-)

    Phoenix - AwardBIOS v6.00PG, An Energy Star Ally
    Copyright (C) 1984-2003, Phoenix Technologies, LTD
*** NAMB-3140 BIOS V1.20 ***
03/27/2006-i845GV-W83627-6A69VAKHC-00

> By the way, some distros bring the CPU in a halted state on a 'halt'
> command, instead of powering off (actually very logical). For real
> powering off these distros require the obvious 'poweroff' command.

Good suggestion. I'm using sysvinit-2.86
http://freshmeat.net/projects/sysvinit/

AFAIU, poweroff is equivalent to halt -p

halt (no option) calls reboot(RB_HALT);
poweroff or halt -p calls reboot(RB_POWER_OFF);
man 2 reboot

Alas, when I run 'poweroff' the kernel prints the same information:

Halting.
Shutdown: hdc
ACPI: PCI interrupt for device 0000:01:05.0 disabled
ACPI: PCI interrupt for device 0000:01:04.0 disabled
ACPI: PCI interrupt for device 0000:01:03.0 disabled
ACPI: PCI interrupt for device 0000:01:02.0 disabled
Power down.
acpi_power_off called

Regards.
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