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I'm using a Canon SX210 IS with CHDK. I know that capturing long exposition photos is a "battery draining" process, but it could be better. Why should the LCD's backlight be on while taking the photo? It might be a bug of CHDK. Otherwise, does anybody know how to turn the backlight off??

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If you can't turn it off - did you try reducing the LCD brightness to its lowest value? –  Queso Oct 18 '10 at 21:14
    
Yes, that's what I do, and is the closesto thing to turn it off. –  tomm89 Oct 18 '10 at 21:39
    
is this really a photography question? Seems more like a technical user manual for a piece of equipment question...? –  andy Oct 25 '10 at 23:12
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@andy: It is a camera question, specifically dealing with battery lifetime. We do more hardware related questions here than anything, so given precedent, it fits. That said, this is really more of a CHDK question, which really probably fits better on the CHDK wiki or forums than here. I don't know if there is a hard reason for either keeping or or closing it, so I've left it up to the community. So far, it seems like the community wants to keep it: no close votes, and 5 up votes. –  jrista Oct 25 '10 at 23:16
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We have had a few CHDK questions in the past, and they are well accepted here. Feel free to ask them in the future, as we most certainly cover hardware and firmware here as well as "photography". –  jrista Oct 30 '10 at 5:59
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1 Answer

Generally, you press the DISP button to cycle through the various display options, one of which is off.

No experience with CHDK, but that's how regular Canons work.

Editing much later to add: I have since installed CHDK on my S90, and the DISP button works the same as with the stock firmware. So simply pressing it should cycle you through basic display, extended info display, and display off.

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