Apple Magic Trackpad doesn't work

My Apple Magic Trackpad used to work with Ubuntu in earlier releases, as advertised. Under current Oneiric, it doesn't function anymore. dmesg shows:

Sep 6 14:27:38 AlexT400s kernel: [ 165.418545] input: Apple Wireless Trackpad as /devices/pci0000:00/0000:00:1a.1/usb4/4-2/4-2:1.0/bluetooth/hci0/hci0:12/input10
Sep 6 14:27:38 AlexT400s kernel: [ 165.418630] magicmouse 0005:05AC:030E.0002: input,hidraw0: BLUETOOTH HID v1.60 Mouse [Apple Wireless Trackpad] on 00:25:56:CB:24:BC
Sep 6 14:27:39 AlexT400s kernel: [ 165.626194] magicmouse 0005:05AC:030E.0002: unable to request touch data (-5)
Sep 6 14:27:39 AlexT400s kernel: [ 165.663205] magicmouse: probe of 0005:05AC:030E.0002 failed with error -5

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: linux-image-3.0.0-10-generic 3.0.0-10.16
ProcVersionSignature: Ubuntu 3.0.0-10.16-generic 3.0.4
Uname: Linux 3.0.0-10-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: hunzikea 1743 F.... pulseaudio
CRDA: Error: [Errno 2] 沒有此一檔案或目錄
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf2620000 irq 47'
   Mixer name : 'Conexant CX20585'
   Components : 'HDA:14f15069,17aa2132,00100301'
   Controls : 8
   Simple ctrls : 5
Card29.Amixer.info:
 Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 6HHT14WW-1.02'
   Mixer name : 'ThinkPad EC 6HHT14WW-1.02'
   Components : ''
   Controls : 1
   Simple ctrls : 1
Card29.Amixer.values:
 Simple mixer control 'Console',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Date: Tue Sep 6 14:38:27 2011
HibernationDevice: RESUME=UUID=5c178cca-7131-4da1-bbc3-6490c981c971
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
MachineType: LENOVO 28239KG
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-10-generic root=UUID=7b361d96-9c1b-4168-b7b1-261e6bd2734d ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.0.0-10-generic N/A
 linux-backports-modules-3.0.0-10-generic N/A
 linux-firmware 1.60
SourcePackage: linux
StagingDrivers: mei
UpgradeStatus: Upgraded to oneiric on 2011-08-27 (10 days ago)
dmi.bios.date: 12/09/2010
dmi.bios.vendor: LENOVO
dmi.bios.version: 6HET34WW (1.19 )
dmi.board.name: 28239KG
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr6HET34WW(1.19):bd12/09/2010:svnLENOVO:pn28239KG:pvrThinkPadT400s:rvnLENOVO:rn28239KG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 28239KG
dmi.product.version: ThinkPad T400s
dmi.sys.vendor: LENOVO