USB port does not work with a screen

Dear All,
My manager has a MacNook Air 10.8 and he is using a large 27'' Apple screen.
He connects the screen to the MacBook Air with a cable which has 3 connections (USB, power, Tundetoh)
He reported to me, that some time, he connect a mouse or a keabord to the USB, at the back of the screen, the two devise does not work, while it works when the devise are connected to USB port of the MacBook Air.
His Macbook Air software are uptodate.
Does you know how to make working the USB devise connect to the screen?
And what does make those trouble?
Cheers
Pierre

Is there special softwer for thunderbolt to update or install?

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