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[Lorenzo Valetti <lorenzo.valetti@xxxxxxxxx>]

I confirm this bug. It affects me as well: just upgraded from 14.04 to 15.04 and then 15.10. In both new versions the touchpad is not working.
NOTE: the buttons DO work, but the tracking of the cursor doesn't.
Also, the workaround mentioned above doesn't work for me, however a slightly modified one does (partially!):

sudo modprobe -r psmouse
sudo modprobe psmouse proto=imps

works for me and enables the touchpad at boot when put in crontab. HOWEVER, the tracking is not good. There is an acceleration problem that makes it uncomfortable to use, and ALSO the two finger scrolling or any other gestures are NOT WORKING.
Thank you.

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https://bugs.launchpad.net/bugs/1511974

Title:
  Touchpad Not Working

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  After upgrading from Ubuntu 14 to 15.10 the touchpad no longer works.
  To get it to work, I must manually reload the mouse drivers through
  terminal. However, this only works for the current session.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-17.21-generic 4.2.3
  Uname: Linux 4.2.0-17-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.19.1-0ubuntu4
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  Date: Sat Oct 31 09:33:20 2015
  DistUpgraded: 2015-10-30 19:09:33,409 DEBUG enabling apt cron job
  DistroCodename: wily
  DistroVariant: ubuntu
  DkmsStatus: fglrx-core, 15.201, 4.2.0-17-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Park [Mobility Radeon HD 5430/5450/5470] [1002:68e0] (prog-if 00 [VGA controller])
     Subsystem: Acer Incorporated [ALI] Device [1025:0360]
  InstallationDate: Installed on 2015-10-30 (1 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  MachineType: Acer Aspire 5553G
  ProcEnviron:
   LANGUAGE=en_US
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-17-generic root=UUID=54ee2d2f-fb32-4d3c-b506-16f0dcbc6d52 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: Upgraded to wily on 2015-10-31 (0 days ago)
  dmi.bios.date: 04/25/2011
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: V1.23
  dmi.board.name: JV51_DN
  dmi.board.vendor: Acer
  dmi.board.version: Not Applicable
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrV1.23:bd04/25/2011:svnAcer:pnAspire5553G:pvrNotApplicable:rvnAcer:rnJV51_DN:rvrNotApplicable:cvnAcer:ct10:cvrN/A:
  dmi.product.name: Aspire 5553G
  dmi.product.version: Not Applicable
  dmi.sys.vendor: Acer
  version.compiz: compiz 1:0.9.12.2+15.10.20151015-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
  xserver.bootTime: Fri Oct 30 21:28:01 2015
  xserver.configfile: default
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.17.2-1ubuntu9
  xserver.video_driver: modeset

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