Comment 107 for bug 444420

If you are trying to use the Logitech MX900 dock as a bluetooth dongle on 9.10 you can do so by using hid2hci. It isn't in the distribution, but you can get the source from here:
http://bluez.cvs.sourceforge.net/viewvc/*checkout*/bluez/utils/tools/hid2hci.c?revision=1.10
Then you have to get the libusb-dev package, and compile it with this command:
$ gcc -o hid2hci hid2hci.c -lusb
After that you can run it as root from this directory, or add it to your PATH.