MBA 13" screen brightness fluctuation?
Working on a mid-2011 MBA 13" 128GB machine I notice what appears to be a fluctuation in the screen brightness. It's periodic, and could be my imagination, but I'll be sitting here typing a msg (as into this blank box) and there seems to be a surge and then a etracement in the overall brightness of the screen, the whole change taking maybe 2 seconds, maybe less. It's a gradual all-over brightening followed by a decrease in brightness to what I assume was the original.
Has anyone else seen this or anything like it? It's fairly subtle, which is why I wonder if I'm seeing it at all.
Thanks.