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Date: Tue, 21 Nov 2006 02:02:48 +0000
From: Matthew Garrett <mjg59@srcf.ucam.org>
To: Theodore Tso <tytso@mit.edu>, Linus Torvalds <torvalds@osdl.org>,
       "Rafael J. Wysocki" <rjw@sisk.pl>,
       Chuck Ebbert <76306.1226@compuserve.com>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@osdl.org>
Subject: Re: [patch] PM: suspend/resume debugging should depend on SOFTWARE_SUSPEND
Message-ID: <20061121020247.GA11206@srcf.ucam.org>
References: <200611190320_MC3-1-D21B-111C@compuserve.com> <Pine.LNX.4.64.0611190930370.3692@woody.osdl.org> <200611191844.14354.rjw@sisk.pl> <Pine.LNX.4.64.0611191008310.3692@woody.osdl.org> <20061120221756.GA8708@thunk.org>
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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@srcf.ucam.org
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