linux-kernel - Re: ahci_softreset prevents acpi_power

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Message-Id: <1168797978.3123.997.camel@laptopd505.fenrus.org>
Date:	Sun, 14 Jan 2007 10:06:18 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Faik Uygur <faik@...dus.org.tr>
Cc:	Robert Hancock <hancockr@...w.ca>,
	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

On Sun, 2007-01-14 at 19:59 +0200, Faik Uygur wrote:
> 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.

Hi,

I'd be interested in finding out how to best test this; if the bios is
really broken I'd love to add a test to the Linux-ready Firmware
Developer Kit for this, so that BIOS developers can make sure future
bioses do not suffer from this bug...

Greetings,
   Arjan van de Ven

-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org

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