@bazzacollins it won't charge my iPad 4 either, must be plugged in to mains 
So it seems the powered USB port on my laptop doesn't kick out enough juice to fully power my iPad Air running as a second screen. Arse.
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@Simon9Hops It's a bugger and no mistaking.
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@bazzacollins USB 2.0 or 3.0 port, out of interest? -
@bazzacollins That’s a surprise. I thought 3 would have kicked out enough! Seems 3 can give 900mA but iPad charger is 2.1A.
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