Connection to Microsoft Designer Keyboard not possible

Hello,

I'm trying to connect my Dell XPS 13 9343 to the Microsoft Designer keyboard and mouse (Bluetooth 4.0).

Via the GUI Tools I'm unable to connect any bluetooth device unfortunately. At least using bluetoothctl I managed to connect an old Logitech bluetooth mouse. When trying to connect the Microsoft mouse for example the tool returns that the connection was successful always.

[Designer Mouse]# connect C2:01:31:4D:2A:06
Attempting to connect to C2:01:31:4D:2A:06
Connection successful
[CHG] Device C2:01:31:4D:2A:06 Connected: no
[CHG] Device C2:01:31:4D:2A:06 Connected: yes

Unfortunately it is not useable afterwards. I also tried to trust or pair it beforehand which didn't change anything.

The syslog shows the following.

Jan 26 19:37:53 avion kernel: [ 435.845874] NET: Registered protocol family 38
Jan 26 19:37:53 avion bluetoothd[900]: Unable to register GATT service with handle 0x000e for device C2:01:31:4D:2A:06:
Jan 26 19:37:54 avion bluetoothd[900]: Error reading PNP_ID value: Attribute requires authentication before read/write
Jan 26 19:38:25 avion kernel: [ 468.649120] Bluetooth: SMP security requested but not available

Some days ago I managed to connect the mouse after several tries but I can't reproduce it. With the keyboard I wasn't successful at all.

If there is anything I can do to solve this problem, let me know.

Thanks and regards,
lum3n

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: bluez 5.35-0ubuntu2
ProcVersionSignature: Ubuntu 4.2.0-25.30-generic 4.2.6
Uname: Linux 4.2.0-25-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Jan 26 19:44:04 2016
InstallationDate: Installed on 2015-07-06 (204 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
InterestingModules: rfcomm bnep btusb bluetooth
MachineType: Dell Inc. XPS 13 9343
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-25-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
SourcePackage: bluez
UdevLog: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/var/log/udev'
UpgradeStatus: Upgraded to wily on 2015-11-02 (84 days ago)
dmi.bios.date: 03/12/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A02
dmi.board.name: 0310JH
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA02:bd03/12/2015:svnDellInc.:pnXPS139343:pvr01:rvnDellInc.:rn0310JH:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: XPS 13 9343
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.
hciconfig:
 hci0: Type: BR/EDR Bus: USB
  BD Address: AC:D1:B8:BF:C7:22 ACL MTU: 1021:8 SCO MTU: 64:1
  UP RUNNING
  RX bytes:276416 acl:15778 sco:0 events:508 errors:0
  TX bytes:37982 acl:40 sco:0 commands:316 errors:0