In this case, you can disable USB wakeup if you don't need USB wakeup.
A quick search finds an tutorial: http://www.das-
werkstatt.com/forum/werkstatt/viewtopic.php?f=7=1985
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Actually it appears that one usb device was the source of the problem.
It's not a common USB device so it's not likely worth fixing.
Bus 005 Device 003: ID 28f3:4000 Clover Network, Inc. Flex
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