linux-kernel - Re: [patch] PM: suspend/resume debugging should depend on SOFTWARE

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Message-ID: <20061121020247.GA11206@srcf.ucam.org>
Date:	Tue, 21 Nov 2006 02:02:48 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Theodore Tso <tytso@....edu>, Linus Torvalds <torvalds@...l.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Chuck Ebbert <76306.1226@...puserve.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [patch] PM: suspend/resume debugging should depend on SOFTWARE_SUSPEND

On Mon, Nov 20, 2006 at 05:17:56PM -0500, Theodore Tso wrote:

> If someone has a suggestion for how I can save the power state of all
> of the various components in my laptop so that the laptop cna be
> brought back to the 18W state after a suspend-to-ram, I'm all ears....

A good start might be to compare the PCI configuration registers before 
and after suspend. However, I suspect it's more complicated than that. 
Are you using the closed ATI drivers? If so, it's possible that they do 
something at X startup that they're not doing on resume. A good 
comparison might be to see if the power consumption is dramatically 
different over suspend/resume if you only boot to text mode - that is, 
never start X at all.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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