found my answer from this thread:
http://forum.ppcgeeks.com/showthread...keyboard+light
Go to settings and hit the button icon. Then, on the bottom of the screen....choose the backlight tab. If you want the auto sensor engaged the make sure the box is checked for "Enable keyboard backlight auto sensor". If the sensor is engaged the keyboard wont come on in the daytime. I have my auto sensor disabled because it has to be really dark for the sensor to activate the keyboard light.....at least on my mogul.