Originally Posted by Gertjan
You're close. The device is put into low power mode after 5 seconds of idle by a call to idle.sh. There is a standby microprocessor in the device which controls power to various components, key input etc (it does not drive the display though). The hwclock-line is called when operation is resumed to sync the Linux clock as it does not get updated while in idle mode.
Thank you for not abanding us!