I've now tested the device on two other systems with older releases; the results seem to point to a regression somewhere between v3.2 and v3.8:
FAILS: linux 3.8.0-35-generic, bluez 4.101-0ubuntu8b1 (same failure mode as Linux v4.2) WORKS: linux 3.2.0-30-generic-pae, bluez 4.98-2ubuntu7 (shows up as an adapter after doing 'hciconfig hci1 up') -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to bluez in Ubuntu. https://bugs.launchpad.net/bugs/1491988 Title: 15.10: Multiple Bluetooth controllers not found Status in bluez package in Ubuntu: In Progress Status in linux package in Ubuntu: In Progress Bug description: $ hcitool dev Devices: hci1 00:10:7A:4D:15:33 hci0 00:1F:3A:E0:0A:AF $ hcitool -i hci1 scan Scanning ... 00:0A:95:4B:BD:C2 Apple Wireless Keyboard $ sudo systemctl restart bluetooth $ journalctl -u bluetooth | grep adapter_service_add Sep 03 19:39:12 hephaestion.lan.iam.tj bluetoothd[3973]: src/adapter.c:adapter_service_add() /org/bluez/hci0 $ bluetoothctl [NEW] Controller 00:1F:3A:E0:0A:AF hephaestion.lan.iam.tj [default] [NEW] Device 00:0A:95:4B:BD:C2 Apple Wireless Keyboard [NEW] Device 00:07:61:3B:86:98 Bluetooth Travel Mouse [NEW] Device 00:19:15:29:83:14 Think Outside Keyboard [bluetooth]# list Controller 00:1F:3A:E0:0A:AF hephaestion.lan.iam.tj [default] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/1491988/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
