Comment 77 for bug 123920

Similarly with the logitech MX 5500 wireless keyboard after upgrading to Oneiric. The dongle was recognised as a Bluetooth adapter, but I couldn't get it to connect to either the keyboard or my phone (pairing succeeds, but then the connection to the device goes 'off', and the toggle to turn it on is greyed out).

Changing the udev rule from "hiddev*" to "hidraw*" sets it back to working as a plain external keyboard.