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[bleathem <862085@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 777074 ***
    https://bugs.launchpad.net/bugs/777074

I am also getting this same problem with my Apple Magic Trackpad on my
Lenovo T540 using only the bluetooth built-in to the laptop, running
Ubuntu 14.04.

My trackpad worked fine on older T510 running Ubuntu 12.04.

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https://bugs.launchpad.net/bugs/862085

Title:
  Apple Magic Trackpad (hid-magicmouse) input freezes on 3 or 4 finger
  touch

Status in Open Input Framework:
  Invalid
Status in Unity:
  Invalid
Status in “linux” package in Ubuntu:
  In Progress
Status in “unity” package in Ubuntu:
  Invalid

Bug description:
  Update: The cause has been traced down to either a kernel or hardware
  issue as per comment #4.

  TEST CASE:

  Test case without X or Unity:

  1. Pair the trackpad using hcitool/hidd utilities.
  2. Run: evtest /dev/input/whatever
  You will see lots of input events for 1 or 2 finger touches. However the evtest event stream freezes when 3 or more fingers are touched.

  Test case in Unity:

  Touch 3 fingers: After a second or two (?!) the grab handles appear but the trackpad goes dead. Only my mouse continues to work. The trackpad comes back to life a while after the grab handles vanish, and I've moved the pointer with the mouse.
  Touch 4 fingers: Trackpad goes dead again. Takes a while before it starts responding again. This also triggers bug 859069.
  I can reproduce the above bugs in Ubuntu 11.04 and 11.10 beta 2 (live).

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: xserver-xorg-input-synaptics 1.3.99+git20110116.0e27ce3a-0ubuntu12.1
  ProcVersionSignature: Ubuntu 2.6.38-11.50-generic 2.6.38.8
  Uname: Linux 2.6.38-11-generic x86_64
  Architecture: amd64
  CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,vpswitch,place,imgpng,regex,unitymtgrabhandles,grid,session,snap,mousepoll,resize,move,animation,expo,ezoom,workarounds,resizeinfo,wall,staticswitcher,fade,scale,unityshell]
  CompositorRunning: compiz
  Date: Thu Sep 29 15:00:41 2011
  DistUpgraded: Fresh install
  DistroCodename: natty
  DistroVariant: ubuntu
  DkmsStatus:
   bcmwl, 5.100.82.38+bdcom, 2.6.38-11-generic, x86_64: installed
   vboxhost, 4.0.10, 2.6.38-11-generic, x86_64: installed
   vboxhost, 4.0.10, 2.6.38-10-generic, x86_64: installed
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0102] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:047e]
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  MachineType: Dell Inc. OptiPlex 990
  ProcEnviron:
   LANGUAGE=en_AU:en
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-11-generic root=UUID=e79b78d3-ed94-4285-8af0-4c7803ef2097 ro quiet splash vt.handoff=7
  Renderer: Unknown
  SourcePackage: xserver-xorg-input-synaptics
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/28/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 0D6H9T
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 15
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA05:bd05/28/2011:svnDellInc.:pnOptiPlex990:pvr01:rvnDellInc.:rn0D6H9T:rvrA00:cvnDellInc.:ct15:cvr:
  dmi.product.name: OptiPlex 990
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.4+bzr20110606-0ubuntu1~natty2vv4
  version.ia32-libs: ia32-libs 20090808ubuntu13
  version.libdrm2: libdrm2 2.4.23-1ubuntu6
  version.libgl1-mesa-dri: libgl1-mesa-dri 7.10.2-0ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.2-0ubuntu2
  version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu3.1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu7.1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu7

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