Originally Posted by Kumabjorn
OK, so now I have the USB keyboard, and I had it connected to both my Kindle and my Sony PRS-T1. No dice in either case. Nothing happened, so obviously the built-in software keyboards don't accept parsing from a connected USB keyboard.
But that was to be expected
As some folks with more knowledge than I have pointed out, you need some software support for that as well: the USB controller needs to be put into "host" mode, and the correct kernel modules for the hardware must be loaded (usbhid and/or hid comes to my mind, but I may be wrong).