I have to keep adjusting the brightness

I have a mid 2010 Macbook Pro 13".  For the past several days whenever it has gone to sleep or when it has been turned off and restarted I have had to go in and adjust the brightness.  When it comes back on the brightness is nearly all the way down.  It has never done this before and I don't know why it has started now.  No new programs have been installed to make it do this.

I tired that.  I even unchecked it and then rechecked it.  The box is checked when I open the display preferences to turn up the brightness after it has dimmed.  The only thing different is that the slider is all the way to the left which is the dim position.  So I slide it back to where I like it but like I said it goes back to dim anytime it has been off for a while.  Thanks.

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