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[Bug 1480615] Re: [Dell Latitude E6540] ALPS touchpad and buttons work only in a single window.


Something a tad weird happened.  While preparing to test upstream
kernels, I started by removing any proprietary AMD driver with:

    sudo apt-get remove --purge fglrx*

(this Dell E6540 laptop comes with a dual video card:  built-in Intel
and "discrete"  AMD Radeon)

After that  I did not experience the issue for several hours, so I
thought that it could have been triggered by the AMD driver.

However, I did make one test:  clean reboot, suspend by closing the lib, then resume by opening the lid.
After that I started experiencing the same issue again.

At least I am able to refine a bit how to reproduce:
- close the lid to suspend, open to resume
- whichever window was at the front at time of the suspend now "owns" the stick/touchapd events, even if it was not "owning" them before suspend
- Ctrl+Alt+F1 then Ctrl+Alt+F7 restores normal behaviour

Let me try to test these newer kernels now.

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  [Dell Latitude E6540] ALPS touchpad and buttons work only in a single

Status in linux package in Ubuntu:

Bug description:
  This is a kernel that has these recent ALPS related patches:

  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
   /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
   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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