I have a proof of concept hack for DX that disables switching to the Power booklet (this is the thing that displays screensaver images), i.e. Kindle goes to sleep as usual (disables accelerometer, keys) but keeps the last page displayed.
I'm currently thinking on how to visualy mark that Kindle is in sleep mode and also how to handle page orientation correctly (there is some glitches if Kindle is in landscape mode).
If somebody wants to test it - I can post a sample script (NOT firmware update at the moment) - you'll need to do some manual stuff from Linux shell over usb networking.
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