linux-kernel - Re: [PATCH] ACPI suspend: Blacklist HP xw4600 Workstation for old code ordering

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Date:	Wed, 15 Oct 2008 23:20:05 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Len Brown <lenb@...nel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	John Brown <john.brown3@...com>
Subject: Re: [PATCH] ACPI suspend: Blacklist HP xw4600 Workstation for old code ordering

On Wednesday, 15 of October 2008, Matthew Garrett wrote:
> On Wed, Oct 15, 2008 at 04:05:35PM +0200, Rafael J. Wysocki wrote:
> > On Wednesday, 15 of October 2008, Matthew Garrett wrote:
> > > I think trying to work out what would be more useful than just adding it to
> > > a blacklist. 
> > 
> > Well, machines that require the "old" ordering are simply broken, because
> > you just can't assume that specific devices are not in D3 before you
> > execute _PTS.
> > 
> > IOW, we aren't doing anything wrong and the BIOS is buggy.
> 
> So how does Windows cope with this?

I don't know. :-(

One possible explanation is that the device causing the trouble is not put
into D3 at all during suspend, but I'm speculating here.

Thanks,
Rafael
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