13" MBP - Screen brightness waxing and waning?

[Skydiver32]

I just got a new MBP , but while using a very simple program - Java based Question bank - ie nothing moving, no graphics, just text -- the brightness of the screen goes down for a few seconds and then lightens up again a few minutes goes by and down ... (like a wave).

The computer is plugged in and a CPU usage monitors (istat) shows a simultaneous spikes with the darkening of the screen.

This is very distracting. What is it, and how do I stop it??

Thanks

 

[nws0291]

Did you turn off the ambient light sensor? Go to sys prefs --> Display --> uncheck automatically adjust.

 

[shollingsw3]

That is the automatic brightness feature of the screen changing the brightness based on the ambient lighting around your notebook. You can turn off this feature by un-checking the box that says "Automatically adjust brightness as ambient light changes" in the Displays dialog box of the System Preferences.

 

[Skydiver32]

Thanks for the very quick response.
I just unchecked it, so lets see what happens .....
Back to my sad life of questions