As a general rule are there types of programs that need to have a reboot in order to be truly 'gone' or installed? I ask this because when I am at work and away from my charger I don't want to waste precious battery life by rebooting. As a Linux newbie I am wondering about programs that may stay in memory (or whatever) and won't be removed till a proper shutdown is done. An example would be my backlight. I have advanced backlight installed and my battery drained quickly today at work. So fast that I didn't get a full day out of light use. I changed the settings in the control panel and the backlight would not go off even after I locked my N810 with the lock button. After a reboot it was back to normal. Had I known I needed a reboot I would have done it after installation but I didn't see anything indicating I needed to do that. Just wondering if there is a Linux rule of thumb that should be followed when installing/uninstalling. Thanks