ambient light sensor problems when typing

I'm not sure if there's a potential problem with your sensor, but disabling it is easy. If you're on Snow Leopard go to System Preferences > Displays > Automatically adjust brightness as ambient light changes.

 

I found this annoying too and disabled it. I just use the brightness controls to adjust it manually if at all needed.

This is the option in Snow Leopard 10.6.2.

 

Are you leaning forward while you type, like to get a better look at the screen? If your head casts a shadow over the sensor, it will dim. Then when you move back, it will brighten again.

 

It's a common problem on the classic MBP. The sensor is placed right under the speaker grill, and it's easy to confuse with the shaddow of your hand..

 

I'm curious: Where is it located for the unibody?

 

Next to the iSight camera

 

A best buy employee said it was the iSight Camera. Thats believable as when I cover up the camera, the screen dims, and the keyboard lights come on.

 

That's more intuitive. Thanks!

 

Nope, it is the iSight camera. The problem with the ambient light sensor is extremely common on the MBP and PowerBook G4s. Even when you don't think your hands are in the way they can be.