Mac Air screen dimming

My Mac Air screen has started to randomly dim.  To get it back to normal brightness, I have to click on the color tab.
In Display options, I have the 'Automatically adjust brightness' box unticked.  In Energy Saver options, all the options to dim the display are unticked.
Help!  It only started happening a couple of weeks ago but it's rather annoying!
Thanks.

There's a slight chance this will help:
Intel-based Macs: Resetting the System Management Controller (SMC)
Otherwise it needs to be serviced.

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