linux-kernel - Re: ahci_softreset prevents acpi_power

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Message-ID: <45AB8553.10301@garzik.org>
Date:	Mon, 15 Jan 2007 08:44:51 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Tejun Heo <htejun@...il.com>
CC:	Arjan van de Ven <arjan@...radead.org>,
	Faik Uygur <faik@...dus.org.tr>,
	Robert Hancock <hancockr@...w.ca>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: ahci_softreset prevents acpi_power_off

Tejun Heo wrote:
> Arjan van de Ven wrote:
>> 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...
> 
> As reported, this is almost a butterfly effect.  ->softreset method is
> only used during initialization and error recovery of ATA devices which
> has almost nothing to do with the rest of the system.  This is almost
> like 'changing my mixer input to line-in makes power off fail'.  (it's
> more related due to ATA ACPI stuff and maybe that's why this happens but
> I'm trying to make a point here.)

It's quite possible that the BIOS in question wants AHCI in some 
specific state at poweroff.

	Jeff



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