linux-kernel - Re: ahci_softreset prevents acpi_power

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Date:	Sun, 14 Jan 2007 19:59:40 +0200
From:	Faik Uygur <faik@...dus.org.tr>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Tejun Heo <htejun@...il.com>, Jeff Garzik <jeff@...zik.org>
Subject: Re: ahci_softreset prevents acpi_power_off

14 Oca 2007 Paz 03:23 tarihinde, Robert Hancock şunları yazmıştı: 
>> [...]
>> > 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..

Checked from the Sony support page for the laptop model and seems the BIOS 
version is the latest.

So it is nothing interesting but a broken BIOS.

Regards,
- Faik
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