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[Philippe Ombredanne <pombredanne@xxxxxxxxx>]

So here is where I am now with the latest kernel update from a few days
ago and everything up-to-date apt-get wise:

$ uname -a
Linux COMPUTER 3.16.0-48-generic #64~14.04.1-Ubuntu SMP Thu Aug 20 23:03:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

As mentioned above, when I reboot, xinput report an incorrect device and
there are various issues with using the touchpad. I am doing a :

modprobe -r psmouse && modprobe psmouse

After that xinput reports AlpsPS/2 ALPS DualPoint TouchPad correctly and
from that point on, things are working mostly fine.  Now and then if the
touchpad stops working correctly, things are resolved by pressing Fn+F5
twice (effectively disabling then enabling the touchpad).

If I ever go in suspend mode, I need to always press Fn+F5  twice to get
a functional touchpad.

Please advise on the next setps I should take.

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https://bugs.launchpad.net/bugs/1480615

Title:
  [Dell Latitude E6540] ALPS touchpad and buttons work only in a single
  window.

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  This is a kernel that has these recent ALPS related patches:
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1258837

  So after a reboot the touchpad and button work fine, at start.

  After a while the buttons, a single tap click, a double tap-click and
  the dual finger scrolling stop working on the correct front-most
  window and work instead on a background window.

  If I Alt-tab to bring the window that receives the touchpad events to
  front, it receives it ok,  so this one window gets mouse events. Using
  either the touchpad or the glidepoint is then limited to this window
  at this point.

  Going to a terminal with ctrl-alt-f1 just a few seconds and then back
  to ctrl-alt-f7 restores things to normal for a while. Until its starts
  again. No dmesg nor syslog show up.

  ApportVersion: 2.14.1-0ubuntu3.11
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  pombreda   1995 F.... pulseaudio
   /dev/snd/controlC0:  pombreda   1995 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=801124f8-51bc-4bec-accf-ba187acdece1
  InstallationDate: Installed on 2015-05-16 (77 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  MachineType: Dell Inc. Latitude E6540
  NonfreeKernelModules: fglrx
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-45-generic root=UUID=df7edfbc-4df5-4603-a42b-c39f769bbb44 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.16.0-45.60~14.04.1-generic 3.16.7-ckt14
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-45-generic N/A
   linux-backports-modules-3.16.0-45-generic  N/A
   linux-firmware                             1.127.14
  Tags:  trusty
  Uname: Linux 3.16.0-45-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin netdev plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 05/19/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A15
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA15:bd05/19/2015:svnDellInc.:pnLatitudeE6540:pvr01:rvnDellInc.:rn:rvr:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E6540
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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