More advanced power savings (rev. the DPMS extension).

[Ian Romanick]

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Egbert Eich wrote:
> Keith Packard writes:
>  > 
>  >  2) Power saving != screen blanking. Backlight levels dominate power use
>  > by LCD screens, so a useful power saving mode is reduced backlight
>  > level, which doesn't blank the screen. We should probably just expose
>  > the backlight level through the X server and let the screen saver frob
>  > that if it likes. 
> 
> Hm, when the backlight is off the screen is essentialy invisible
> (except for the OLPC system in monochrome mode). If not driving the 
> output will save you an additional amount of power you may want
> to turn off more components on the chip.

There is middle ground here.  Mac laptops will reduce the brightness of
the backlight to 50% after a minute or so of inactivity, then shut it
off after a few more minutes.
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