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[teo1978 <teo8976@xxxxxxxxx>]

I thought this had been fixed because i stopped observing it, but now
it's happening again.

So, either this was fixed and then broken again (unlikely), or more
likely this is intermittent, perhaps triggered by some particular event.

This should have very high priority, as it renders any laptop completely
unusable unless you have an external mouse.

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https://bugs.launchpad.net/bugs/1380320

Title:
  [REGRESSION] touchpad behavior broken: left button press delayed if
  finger is on touchpad

Status in Unity:
  Confirmed
Status in unity package in Ubuntu:
  Confirmed

Bug description:
  This is a REGRESSION. This used to work fine. I don't know when
  exactly it broke.

  Steps to reproduce: Test 1 and Test 2 should both behave the same as
  test 2, but test 1 gives nonsense and dangerous results.

  --Test 1--
  - place finger 1  on the touchpad
  - move the finger around while keeping it in contact with the touchpad => the mouse cursor moves around as expected
  - with another finger 2, press the left button and hold it, while finger 1 is still on the touchpad, at point "A"
  - (*) move finger 1 around on the touchpad to some other point B, then stop moving it
  - move finger 1 around again, to point C
  - only then, release the left button

  -- Test 2 --
  - place finger 1 on the touchpad
  - move the finger around as in test 1
  - take finger 1 away from the touchpad, leaving the cursor at point A
  - with another finger 2, press the left button and hold it
  - place finger 1 on the touchpad again and move it around, then stop at  point B.
  - Move finger 1 a bit more, to point C
  - release the left button

  Expected result:
  OBVIOUSLY, in both cases, the behavior should be the same. A left button press should be registered at point A, then a drag movement to B and then C, and then a button release. If, for example, at point A you hit something draggable, the result is that you drag it and drop to point C

  Observed result:
  Test 2 behaves as expected
  However, in test 1, nothing happens when you actually press the button. Instead, a button press is registered when finger 1 pauses at point B. That is, everything behaves as if you had pressed the mouse button at a completely different place and time than you did. The result is dragging from point B to point C.

  The consequences can be disastrous. This can lead to data loss,
  because a click may be registered on a button that delete things, or
  the drag-and-move operation that is executed (completely unrelated to
  the real action of the user) may be that of moving an object to a
  place where you're not supposed to move it (e.g. moving a file to the
  trash or whatever).

  This can literally  result in formatting your hard drive.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity 7.2.2+14.04.20140714-0ubuntu1.1
  ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
  Uname: Linux 3.13.0-37-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CurrentDesktop: Unity
  Date: Sun Oct 12 17:17:03 2014
  InstallationDate: Installed on 2013-10-11 (365 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  SourcePackage: unity
  UpgradeStatus: Upgraded to trusty on 2014-05-24 (140 days ago)

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