I have an external keyboard (Goldtouch) connected to my Mac.

When the Mac is sleeping and I hit some key on the external keyboard, the Mac wakes up as it should. However, I can't type anything using the external keyboard, nor even does the capslock light work when I try to toggle capslock...

This is only resolved after I disconnect and then reconnect the keyboard.

What could be the problem?

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Have you tried a different keyboard? – jcrawfordor Aug 20 '11 at 23:23
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