It's over at http://forums.cnet.com/5204-13974_102-0.html?forumID=152&tag=rb_mtx;f06-fd
Yes, my brother had the same issue on an Acer. He had to diddle with the power plan one more time.
This time it worked.
For some reason, I am unable to raise the brightness to max when my 1720 laptop is plugged in. I am, however, able to raise the brightness to max while on battery. If I raise it to max while on battery and then plug it in, the brightness goes down automatically and I am unable to raise back to max, unless I unplug it again. That seems backwards to what should happen.
I'm running windows Vista, but I doubt that matters. I've checked my power plan/brightness settings and cannot figure out what's wrong. Thanks ahead of time for your help.