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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

This should also be fixed in Utopic as of 3.16.0-34:

git describe --contains 33f561e
Ubuntu-3.16.0-34.45~27


** Changed in: linux (Ubuntu Utopic)
       Status: Fix Committed => Fix Released

** Changed in: linux (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1425445

Title:
  Regression: 3.16.0-31-generic breaks touchpad on Dell XPS13 (2015)

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Utopic:
  Fix Released

Bug description:
  Today’s kernel update breaks the touchpad on the 2015 Dell XPS13. On
  3.16.0-30-generic the touchpad worked fine.

  Symptoms are that the touchpad stops responding at random times.

  A possible cause is this patch:
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d1c7e29e8d276c669e8790bb8be9f505ddc48888

  See also those two bug reports for a more detailed discussion of the I2C issues caused by the above patch and the XPS13:
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1416601
  https://bugzilla.redhat.com/show_bug.cgi?id=1188439

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-31-generic 3.16.0-31.41
  ProcVersionSignature: Ubuntu 3.16.0-31.41-generic 3.16.7-ckt5
  Uname: Linux 3.16.0-31-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.14.7-0ubuntu8.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jan        2547 F.... pulseaudio
   /dev/snd/controlC1:  jan        2547 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Wed Feb 25 10:19:01 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-01-30 (25 days ago)
  InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: Dell Inc. XPS 13 9343
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-31-generic.efi.signed root=UUID=e4431ecc-e85e-4e35-92af-58f455c46c2b ro kvm-intel.nested=1 "acpi_osi=!Windows 2013" psmouse.resetafter=0 quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-31-generic N/A
   linux-backports-modules-3.16.0-31-generic  N/A
   linux-firmware                             1.138.1
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/04/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A00
  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.:bvrA00:bd11/04/2014:svnDellInc.:pnXPS139343:pvr01:rvnDellInc.:rn0310JH:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 13 9343
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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