Should green_saver.ko shut off a laptop's backlight?

[Doug Barton]

On 11/29/2010 07:09, John Baldwin wrote:
> 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 at 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.

Ok, so does the attached seem reasonable?



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 .\"
 .\" $FreeBSD$
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-.Dd April 7, 2010
+.Dd November 29, 2010
 .Dt SPLASH 4
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 .Sh NAME
@@ -114,7 +114,12 @@
 .It Pa fire_saver.ko
 A fire which becomes higher as load increases.
 .It Pa green_saver.ko
-If the monitor supports power saving mode, it will be turned off.
+The screen will be blanked, similar to
+.Pa blank_saver.ko .
+If the monitor and/or the video card's BIOS support it,
+the screen will also be powered off.
+The latter may not work with LCD monitors,
+or monitors connected to a Digital Visual Interface (DVI) port.
 .It Pa logo_saver.ko
 Animated graphical
 .Fx