This patch allows user to turn off the frontlight completely.
Nothing fancy, as usual, with a jailbroken Kindle, just use the appropriate update file: copy it to the Kindle's USB drive's root, then launch it by going to [Menu] -> Settings -> [Menu] -> Update Your Kindle.
Just set brightness to lowest level and the frontlight will be turned off after one minute or less.
Alexey Avdyukhin, from Russia with love. mailto: clusterrr@clusterrr.com