lcd monitors and screensavers

[Henry Spencer]

On Tue, 4 Jan 2005, Francois Ouellette wrote:
> With LCD monitors you want to save the backlight if it is so equipped.
> Showing a 3D maze or any other nonsense will not help!
> Use the "blank screen" and this should turn off the backlighting system.

Unfortunately, it's quite possible to have the screen black with the
backlight still turned on.  To get the monitor into a DPMS powerdown mode
requires special signaling, not just an all-black image. 

Typically it's easy enough to tell the difference.  An all-black image is
not really quite 100% black -- a little bit of light from the backlight
leaks out -- and the onset of powerdown is signaled both by the screen
going *really* dark, and (typically) by the monitor's power LED turning
from green to amber. 

                                                          Henry Spencer
                                                       henry-lqW1N6Cllo0sV2N9l4h3zg at public.gmane.org

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