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[Stefano Maffulli <1454473@xxxxxxxxxxxxxxxxxx>]

I have restricted the bad behavior to XChat-gnome at this point. At
least that's the most visible program where this issue becomes apparent.
LibreOffice, Firefox, Thunderbird and Nautilus seem to respect the
touch-to-click disabled in the Unity config panel.

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https://bugs.launchpad.net/bugs/1454473

Title:
  In Ubuntu 15.04, simply moving the mouse via touchpad scrolls the
  window

Status in xserver-xorg-input-synaptics package in Ubuntu:
  Confirmed

Bug description:
  Version: Ubuntu 3.19.0-16.16-generic 3.19.3

  (This is mostly a copy paste from here:
  http://askubuntu.com/questions/617117/in-ubuntu-15-04-simply-moving-
  the-mouse-via-touchpad-scrolls-the-window)

  When I first boot everything works fine. But then something happens
  (not sure what triggers it) and many programs start scrolling just by
  moving the mouse over the window. So far I see this happens in
  Nautilus, Document Reader, Archive Manager, Ubuntu Software Center,
  Meld, and System Monitor (what do they all have in common, GTK?). It
  does NOT happen in web browsers, thunderbird, programs using Mono,
  Java, etc, for some reason.

  To be more specific of the issue: if the mouse starting position is
  over a document in Document Reader, for example, and then I move the
  mouse via touchpad, it'll scroll the document like an anchor, where
  the position of the mouse over the document doesn't change (yet it
  scrolls). I have already tried disabling "two finger scroll", "disable
  while typing", and the "tap to click" options, but they made no
  difference (after the glitchiness starts).

  The other odd case is that in Nautilus, if the mouse starting position
  is over a file or directory, it sometimes selects it instead of
  scrolling. Single-clicking a directory will open the directory (so the
  initial touch acts like a clicks, and letting go acts as the second
  click).

  The only thing I can do to temporarily fix the problem is restart the
  computer. There are no issues when using a mouse.

  Update 2015/05/03: I see how to reproduce it now. It appears to be a
  glitchy two-finger scroll issue. If you scroll any window with two
  fingers a lot, eventually it'll start causing this problem. Try
  various actions with two fingers, like "clicking" with two fingers, or
  scrolling in various directions quickly, etc, and it will start
  happening. It's interesting that it only happens in certain programs
  and not in others, which makes me wonder whether it is really a
  trackpad issue or some framework's issue. I can confirm that this is
  happening on the 15.04 Live CD, so this happens out of the box.

  The only work-around for this issue is to disable two-finger scroll
  (if it's already glitchy you'll need to restart). Not sure if it
  matters, but I'm using the Dell XPS 13 2015 9343.

  Update 2015/05/05: Apparently this bug can still happen even with two-
  finger scroll off, though it's more rare. Again, only certain programs
  have the issue, so it's hard to tell if it's a touchpad issue or
  something else.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-16-generic 3.19.0-16.16
  ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
  Uname: Linux 3.19.0-16-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ephi       1857 F.... pulseaudio
   /dev/snd/controlC0:  ephi       1857 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue May 12 22:06:46 2015
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=270ecec3-b78c-4f85-a337-acd54f5e0b0e
  InstallationDate: Installed on 2015-05-01 (12 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  Lsusb:
   Bus 001 Device 004: ID 0bda:5682 Realtek Semiconductor Corp.
   Bus 001 Device 003: ID 0a5c:216f Broadcom Corp.
   Bus 001 Device 010: ID 1d57:ac01 Xenta Wireless Receiver (Keyboard and Mouse)
   Bus 001 Device 002: ID 8087:8001 Intel Corp.
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. XPS 13 9343
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-16-generic.efi.signed root=UUID=2bf488f3-23aa-4837-8f4d-861be61c94bc ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-16-generic N/A
   linux-backports-modules-3.19.0-16-generic  N/A
   linux-firmware                             1.143
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/25/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A03
  dmi.board.name: 0TM99H
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA03:bd03/25/2015:svnDellInc.:pnXPS139343:pvr01:rvnDellInc.:rn0TM99H:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 13 9343
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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