hi again, i need to adjust the brightness on my E6400 laptop, windows 7 professional laptop. my laptop has a few buttons with a little "sun" looking button w/ arrows pointing in different directions. one of them has a sun logo and says "auto" . none of these buttons adjust anything . i did try to use the "FN" button and doesnt work. i also went to the power management to change settings but i guess my laptop is so old that it doesnt have that option? im trying to save energy and also i hate the brightness. help plz