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[dp <1034132@xxxxxxxxxxxxxxxxxx>]

With Ubuntu 13.04, this issue gained in severity. I could previously apply the patch mentioned in the first post to the appletouch driver and replace appletouch.ko with my custom version.
However, the appletouch driver I have access to *without* fiddling with the entire kernel sources will no longer load in the Ubuntu 13.04 kernel.

Thus, there is no longer a workaround.

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https://bugs.launchpad.net/bugs/1034132

Title:
  Macbook touchpad cursor moving in steps

Status in “linux” package in Ubuntu:
  Confirmed
Status in Fedora:
  New

Bug description:
  I'm on a MacBook2,1, running a fully updated Ubuntu 12.04. When using
  the internal Touchpad (appletouch driver), the cursor only moves
  horizontally or vertically. When dragging a diagonal line, the cursor
  will move in steps, basically rendering the builtin touchpad unusable.

  This issue is also described in a forum thread:
  http://ubuntuforums.org/showthread.php?t=813884&page=6

  In the second post on page 6 describes a solution. In the linux
  kernel, in appletouch.c, change the following two defines:

  Original:

  #define ATP_FUZZ 16

  #define ATP_THRESHOLD 5

  New:

  #define ATP_FUZZ 0

  #define ATP_THRESHOLD 3

  and recompile.

  I tried this and can confirm that the touchpad is now fully usable.
  However, recompiling the kernel takes several hours and *all* of the
  disk space on my laptop. Doing this on every kernel update is just not
  practical.

  I would therefore like to ask that this be applied as a patch to the default ubuntu kernel.
  At the very least, please make an optional package containing the patched appletouch driver that can be selectively installed by people having this issue.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-generic 3.2.0.27.29
  ProcVersionSignature: Ubuntu 3.2.0-27.43-generic 3.2.21
  Uname: Linux 3.2.0-27-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu12
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  damian     1778 F.... pulseaudio
  CRDA:
   country AW:
   	(2402 - 2482 @ 40), (N/A, 20)
   	(5170 - 5250 @ 40), (N/A, 20)
   	(5250 - 5330 @ 40), (N/A, 20), DFS
   	(5490 - 5710 @ 40), (N/A, 27), DFS
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0x90440000 irq 43'
     Mixer name	: 'SigmaTel STAC9221 A1'
     Components	: 'HDA:83847680,106b2200,00103401'
     Controls      : 25
     Simple ctrls  : 13
  Date: Tue Aug  7 21:35:12 2012
  HibernationDevice: RESUME=UUID=a7716e7d-8718-4fe9-988f-958519d6a2c2
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64+mac (20120425.1)
  MachineType: Apple Inc. MacBook2,1
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-27-generic root=UUID=c63dd388-29f9-43dc-a835-0b471ccb2f85 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-27-generic N/A
   linux-backports-modules-3.2.0-27-generic  N/A
   linux-firmware                            1.79
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/27/07
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MB21.88Z.00A5.B07.0706270922
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Mac-F4208CA9
  dmi.board.vendor: Apple Inc.
  dmi.board.version: PVT
  dmi.chassis.asset.tag: Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-F4208CA9
  dmi.modalias: dmi:bvnAppleInc.:bvrMB21.88Z.00A5.B07.0706270922:bd06/27/07:svnAppleInc.:pnMacBook2,1:pvr1.0:rvnAppleInc.:rnMac-F4208CA9:rvrPVT:cvnAppleInc.:ct10:cvrMac-F4208CA9:
  dmi.product.name: MacBook2,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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