[yparitcher]

a few helpful tips. (i made a custom dynamic screensaver generator, and ran into many of the same issues)

you can unload the amazon screensaver module with lipc allowing the kindle to suspend without showing a screensaver by

lipc-set-prop -s com.lab126.blanket unload screensaver

and when bailing out a corresponding

lipc-set-prop -s com.lab126.blanket load screensaver

this module also takes care of refreshing the screen on wake-up so take care when disabling it



you can then register for sleep and wakeup events and trigger your script on wakeup and then resetting the wakeup timer & going back to sleep all with lipc

lipc-wait-event -m com.lab126.powerd goingToScreenSaver,wakeupFromSuspend,readyToSuspend | while read event; do
	case "$event" in
		goingToScreenSaver*)
			custom_function;;
		wakeupFromSuspend*)
			custom_function;;
		readyToSuspend*)
			custom_function;;
	esac
done;

to set the wakeup timer use

lipc-set-prop com.lab126.powerd rtcWakeup xxx

replacing xxx with a integer amount. one limitation. this property can only be set in the readyToSuspend state.

the kindle suspend state cycle is like this:

Awake -> goingToScreenSaver -> ScreenSaver -> readyToSuspend -> Suspended -> wakeupFromSuspend -> ScreenSaver -> outOfScreenSaver -> Awake

i am not sure how long the kindle spends in the ScreenSaver & readyToSuspend states. it might be longer than a minute and therefore useless to you. however you can try what what koreader does to prompt a suspend: https://github.com/koreader/koreader...owerd.lua#L103

lipc-set-prop com.lab126.powerd powerButton 1

to simulate a power button press. this might speed up the suspend procces (not sure i never tested this.)



you can see my work here (in shell) https://github.com/yparitcher/kindle...zman_backround
the project currently uses the lipc C interface https://github.com/yparitcher/kindle-zmanim