FWIW I literally cut power between the n800 and a powered hub. A keyboard connected to the powered hub worked with the n800. My laptop found the keyboard but got confused and kept disconnecting / reconnecting the keyboard.

If the USB charging is the only issue, that may be a workaround. I would not be surprised if there were also USB driver issues.

If you try this remember to only cut power, not ground. There are pinouts / descriptions of the different wire colors elsewhere online.