linux-kernel - Re: ahci_softreset prevents acpi_power

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Date:	Sun, 14 Jan 2007 19:50:14 +0200
From:	Faik Uygur <faik@...dus.org.tr>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Robert Hancock <hancockr@...w.ca>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Tejun Heo <htejun@...il.com>
Subject: Re: ahci_softreset prevents acpi_power_off

14 Oca 2007 Paz 05:18 tarihinde şunları yazmıştınız:
>> [...]
> > 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...

With the same .config used and with CONFIG_SATA_ACPI defined as default
in 2.6.20-rc4-mm1 the machine did not poweroff again.

> 	Jeff

Regards,
- Faik
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