linux-kernel - Re: ahci_softreset prevents acpi_power

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Date:	Sat, 13 Jan 2007 22:18:10 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Robert Hancock <hancockr@...w.ca>
CC:	Faik Uygur <faik@...dus.org.tr>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Tejun Heo <htejun@...il.com>
Subject: Re: ahci_softreset prevents acpi_power_off

Robert Hancock wrote:
> Faik Uygur wrote:
>>> What happens when you try to shutdown?  
>>
>> Does not shutdown and freezes.
>>
>> Hand copied last messages seen on console:
>>
>> Synchronizing SCSI cache for disk sda:
>> ACPI: PCI Interrupt for device 0000:06:08.0 disabled
>> Power down.
>> acpi_power_off called
>>   hwsleep-0285 [01] enter_sleep_state    : Entering sleep state [S5]
> 
> Since you're getting to this point I think this has to be some kind of 
> BIOS interaction causing this. The only thing that happens after the 
> "Entering sleep state" is that the kernel writes to some ACPI registers 
> to tell the hardware to power down. I think some laptop BIOSes do things 
> on ACPI power down like try to park the drive heads, etc. and maybe this 
> change that you found from git bisecting is somehow interfering with it 
> doing this?
> 
> Might want to check for a BIOS update first of all..

It would be interesting to try -mm, which includes ACPI support for ATA...

	Jeff



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