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[Tim Peeters <1276740@xxxxxxxxxxxxxxxxxx>]

hurray :) the issue seems to have been fixed in linux-3.17rc1. I downloaded:
- linux-headers-3.17.0-031700rc1-generic_3.17.0-031700rc1.201409021903_amd64.deb
- linux-headers-3.17.0-031700rc1_3.17.0-031700rc1.201409021903_all.deb
- linux-image-3.17.0-031700rc1-generic_3.17.0-031700rc1.201409021903_amd64.deb

from http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.17-rc1-utopic/ and
installed the three files using 'dpkg -i *.deb'. Now the touchpad works
without applying an additional patch.

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https://bugs.launchpad.net/bugs/1276740

Title:
  [Acer C720] Touchpad not recognized since kernel upgrade

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  This is on Ubuntu 13.10, kernel 3.11.0-15 on an Acer C720 Chromebook
  with a Synaptics touchpad.

  A USB or bluetooth mouse works fine.

  The trackpad is no longer in the list of devices in xinput as it had
  been before.

  $ apt-cache policy  xserver-xorg-input-synaptics
  xserver-xorg-input-synaptics:
    Installed: 1.7.1-0ubuntu1
    Candidate: 1.7.1-0ubuntu1
    Version table:
   *** 1.7.1-0ubuntu1 0
          500 http://us.archive.ubuntu.com/ubuntu/ saucy/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-15-generic 3.11.0-15.25
  ProcVersionSignature: Ubuntu 3.11.0-15.25-generic 3.11.10
  Uname: Linux 3.11.0-15-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  fredlaxton   1532 F.... pulseaudio
   /dev/snd/controlC0:  fredlaxton   1532 F.... pulseaudio
  Date: Wed Feb  5 13:16:57 2014
  MachineType: Acer Peppy
  MarkForUpload: True
  ProcFB:
   0 inteldrmfb
   1 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-15-generic root=UUID=b9c60669-34d9-460f-ac3e-35db5665dfeb ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-15-generic N/A
   linux-backports-modules-3.11.0-15-generic  N/A
   linux-firmware                             1.116
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/29/2013
  dmi.bios.vendor: coreboot
  dmi.chassis.type: 3
  dmi.chassis.vendor: Acer
  dmi.modalias: dmi:bvncoreboot:bvr:bd10/29/2013:svnAcer:pnPeppy:pvr1.0:cvnAcer:ct3:cvr:
  dmi.product.name: Peppy
  dmi.product.version: 1.0
  dmi.sys.vendor: Acer

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