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[Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>]

Systemd PR: https://github.com/systemd/systemd/pull/5591

** Also affects: systemd (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1657553

Title:
  Laptop stick and touchpad problems after linux 4.4 update

Status in linux package in Ubuntu:
  Incomplete
Status in systemd package in Ubuntu:
  New
Status in linux source package in Xenial:
  Incomplete
Status in systemd source package in Xenial:
  New

Bug description:
  Ever since the 4.4.0-53 kernel update the touchpad and trackpoint have behaved erratically on my Dell Precision 7510:
  * The trackpoint moves WAY too fast and there don't seem to be any parameters I can change in xinput to fix this. It is essentially unusable.
  * The touchpad starts with parameters set incorrectly.
  * Touchpad tap to click is now turned on again and is very sensitive. This I can change through xinput but the change is still odd.
  * The two finger scrolling is set incorrectly to be highly sensitive. This I can also change through xinput.
  * Two finger scrolling still activates often during normal use of the trackpad. To the extent that I had to turn off two finger scrolling to stop inadvertent scrolling.

  All of the above behavior is new going from 4.4.0-47 to -53.
  Previously this all worked perfectly on this machine.

  Seems to be symptoms noted by these other users on askubuntu here as
  well: http://askubuntu.com/questions/862527/laptop-stick-mouse-
  problems-after-linux-4-4-update-on-14-04

  The touchpad symptoms I seem to be able to work around my changing
  xinput parameters, but the trackpoint I have not been able to fix at
  all (which is sad since that is my primary mouse device normally).
  Would appreciate any suggestions as to how to revert the old behavior.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-53-generic 4.4.0-53.74
  ProcVersionSignature: Ubuntu 4.4.0-59.80-generic 4.4.35
  Uname: Linux 4.4.0-59-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  jpeverill   2813 F.... pulseaudio
   /dev/snd/controlC0:  jpeverill   2813 F.... pulseaudio
  Date: Wed Jan 18 10:21:55 2017
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-07-17 (916 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 002: ID 8087:0a2b Intel Corp. 
   Bus 001 Device 004: ID 1bcf:2b91 Sunplus Innovation Technology Inc. 
   Bus 001 Device 003: ID 0a5c:5832 Broadcom Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. Precision 7510
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-59-generic.efi.signed root=UUID=4a4cfeb0-ad39-4293-bcaf-000d6538b550 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-59-generic N/A
   linux-backports-modules-4.4.0-59-generic  N/A
   linux-firmware                            1.157.6
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-05-01 (262 days ago)
  dmi.bios.date: 01/24/2016
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.3.10
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr1.3.10:bd01/24/2016:svnDellInc.:pnPrecision7510:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct9:cvr:
  dmi.product.name: Precision 7510
  dmi.sys.vendor: Dell Inc.

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