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To: Brad Karp <bkarp+@cs.cmu.edu>
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From: Dan Pelleg <daniel+bsd@pelleg.org>
Date: 30 Oct 2003 10:55:25 -0500
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cc: freebsd-mobile@freebsd.org
Subject: Re: "deeper sleep mode" support in -STABLE?
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Brad Karp <bkarp+@cs.cmu.edu> writes:

> Hello, all.
> 
> I read Marko Zec's post to -mobile with great interest:
> 
> http://www.freebsd.org/cgi/getmsg.cgi?fetch=176046+181234+/usr/local/www/db/text/2003/freebsd-mobile/20031019.freebsd-mobile
> 
> This post offers a nifty patch to use the new "deeper sleep" mode supported
> on P-III-M, IV-M, and "Centrino" Pentium Mobile processors. Marko reports
> that he gets 18% additional battery life with the LCD on using this mode
> vs. the "HLT" idle loop method used in -STABLE today, and 22% longer life
> with the LCD off.
> 
> The patch he posted:
> 
> http://www.tel.fer.hr/zec/BSD/pm/4.8-ich-ds.patch
> 
> Have others tried his patch and had good luck with it? I've got a ThinkPad
> X31, and am considering giving it a go. I presume it will apply reasonably
> cleanly to 4.9-RELEASE, though I've not tried yet.
> 
> Also: are any committers looking at this patch for inclusion in either the
> -STABLE or -CURRENT branches? (Or does ACPI achieve the same power savings
> that this patch does?)
> 
> Many thanks to Marko for passing this patch along!
> 
> -Brad, bkarp@cs.cmu.edu

The patch applies, but not cleanly, and doesn't compile. Marko
told me in personal mail he's planning to work on -STABLE
support.

-- 

  Dan Pelleg