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From: Jeff Garzik <jeff@garzik.org>
To: Tejun Heo <htejun@gmail.com>
Cc: Arjan van de Ven <arjan@infradead.org>,
	Faik Uygur <faik@pardus.org.tr>,
	Robert Hancock <hancockr@shaw.ca>,
	linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: ahci_softreset prevents acpi_power_off
Date: Mon, 15 Jan 2007 08:44:51 -0500	[thread overview]
Message-ID: <45AB8553.10301@garzik.org> (raw)
In-Reply-To: <45AAFCC6.9000700@gmail.com>

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




  reply	other threads:[~2007-01-15 13:45 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <fa.enjQgtLFPdSkeJjKv6eOjULTovQ@ifi.uio.no>
     [not found] ` <fa.1s/e9SHVR6LQC2HgdZRykrqlV5Q@ifi.uio.no>
     [not found]   ` <fa.kpxGqupQMKJxBBFrktFUzuoKc7c@ifi.uio.no>
2007-01-14  1:23     ` Robert Hancock
2007-01-14  3:18       ` Jeff Garzik
2007-01-14 17:50         ` Faik Uygur
2007-01-14 17:59       ` Faik Uygur
2007-01-14 18:06         ` Arjan van de Ven
2007-01-14 18:58           ` Faik Uygur
2007-01-15  4:02           ` Tejun Heo
2007-01-15 13:44             ` Jeff Garzik [this message]
2007-01-15 13:55               ` Tejun Heo
2007-01-11 10:31 Faik Uygur
2007-01-13  1:12 ` Tejun Heo
2007-01-13  5:59   ` Faik Uygur
2007-01-13 12:10   ` Faik Uygur

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