The Nokia N85 charges merrily from laptop/desktop usb ports but will only charge on the mains using its own power adapter. If you stick an N85 cable into a mains usb charger such as a Blackberry charger (which charges everthing else under the sun) it just won't charge unless you hack the cable and short the data lines.
Is it possible that the Kindle is acting in a similar fashion ? The shorting of the data lines is to do with the latest standard for usb charging which seems to pump a bit more power.
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