Comment 9 for bug 658471

Additional info:

With default Natty configuration in /lib/udev/rules.d/70-hid2hci.rules, I get the following three devices reported by lsusb:

Bus 005 Device 025: ID 046d:c71c Logitech, Inc.
Bus 005 Device 024: ID 046d:c71b Logitech, Inc.
Bus 005 Device 023: ID 046d:0b06 Logitech, Inc.

After the change suggested by this bug report, I get all three of those devices plus an additional device that did not appear before at all:

Bus 005 Device 026: ID 046d:c709 Logitech, Inc. BT Mini-Receiver (HCI mode)
Bus 005 Device 025: ID 046d:c71c Logitech, Inc.
Bus 005 Device 024: ID 046d:c71b Logitech, Inc.
Bus 005 Device 023: ID 046d:0b06 Logitech, Inc.

It seems it's not just the mode that changes for the existing devices, but also involves the detection of additional hardware. I hope my suggestion about the Additional Drivers function in the previous comment is something that might have some appeal... it would preserve default "plug and play" functionality while allowing a clear and direct upgrade/configuration path to connect the devices properly via Bluetooth. This problem has been one of the top generators of "Logitech" related bugs in Ubuntu since 8.04, that's over seven major revisions of the OS, and I'm sure the devs are tired of seeing it crop up repeatedly.