[Trac #1419] Screen refresh rate should be dynamic to save power.

[Zarro Boogs per Child]

#1419: Screen refresh rate should be dynamic to save power.
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 Reporter:  jg               |       Owner:  JordanCrouse
     Type:  enhancement      |      Status:  new         
 Priority:  normal           |   Milestone:  BTest-4     
Component:  x window system  |    Keywords:              
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 Up to 100mw of power can be saved by controlling the refresh speed of the
 screen.  This is very significant in Ebook mode.

 Whenever the X server transitions from not drawing to drawing, the refresh
 rate should be increased to its normal 50hz at the next vertical retrace
 (being slightly more clever than just going non-idle may be worthwhile; we
 can use the damage facilities, I suspect, to know if the screen has been
 touched).  Whenever the X server goes idle, the refresh rate should be
 dropped to a frame rate of (tbd) at the next vertical retrace.  This will
 require cooperation with the device driver.

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Ticket URL: <http://dev.laptop.org/ticket/1419>
One Laptop Per Child <http://laptop.org/>