Happens to me sometimes when powering on from suspend -- any USB device
plugged in will get the following:

usb 5-1: new full-speed USB device number 21 using uhci_hcd
usb 5-1: device descriptor read/64, error -110

No plugged-in USB device will be properly detected until a cold boot --
camera, mouse, keyboard or harddrive.  This is Ubuntus 12.10 through
13.10; may be a hardware problem, but again: it only happens to me after
the computer has been in Suspend power mode, and not every time.

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https://bugs.launchpad.net/bugs/433438

Title:
  device descriptor read/64, error -110

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