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From: John Baldwin <jhb@freebsd.org>
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Cc: Adam Vande More <amvandemore@gmail.com>, Doug Barton <dougb@freebsd.org>
Subject: Re: Should green_saver.ko shut off a laptop's backlight?
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On Saturday, November 27, 2010 11:30:56 pm Adam Vande More wrote:
> On Sat, Nov 27, 2010 at 6:39 PM, Doug Barton <dougb@freebsd.org> wrote:
> 
> > My recollection is that green_saver should turn off an LCD backlight, but I
> > just loaded it up on my laptop and it's not doing so. It does remove the
> > text from the screen, but the backlight is still on (i.e., it is doing
> > exactly what blank_saver does).
> >
> > When running X DPMS works on that same laptop, so I know the hardware is
> > capable. This is 9-current amd64 at r214025. Any suggestions are welcome.
> >
> 
> It's never worked for me either and this has been around awhile.
> 
> http://www.freebsd.org/cgi/query-pr.cgi?pr=114928&cat=

green_saver just ask's your video card's BIOS to shut the screen off.  If the
BIOS doesn't turn off the backlight, that is the BIOS's problem, not
something we can fix.

-- 
John Baldwin