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[Daniel d'Andrada <daniel.dandrada@xxxxxxxxxxxxx>]

Any QML application at all will do (such as "Item
{width:600;height:600}")

What seems to be happening, from what I've learned so far:

- user touches on a qml application
- xserver sends the resulting touch events to both the qmlscene and to compiz/unity7
- xserver offers ownership to compiz/unity7
- qmlscene does XIGrabDevice on the touch screen
- compiz/unity7 rejects the touch
- user lifts finger and touch ends
- qmlscene does XIUngrabDevice on the touch screen
- user lands a new finger, this time on the desktop
- xserver still has in its bookkeeping that the previous touch is active and thus deny pointer emulation for that new touch

And from that point onwards xserver is left with a bogus state, even
after the qml app is closed. Restarting it being the sure way to clean
it up and reproduce the issue anew (otherwise further issues seem to
crop up)

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https://bugs.launchpad.net/bugs/1307701

Title:
  Unity does not get touch events when QML apps running

Status in OEM Priority Project:
  New
Status in OEM Priority Project trusty series:
  Triaged
Status in “unity” package in Ubuntu:
  In Progress

Bug description:
  When running an SDK app on the desktop, it's not possible to use the
  touchscreen to move windows, use the launcher, etc. The SDK app seems
  to consume all touchscreen events.

  To reproduce:
  1) On a desktop/laptop with a touchscreen (I am using a Dell XPS13), install 14.04 and check that the touchscreen works for moving windows
  2) Install the camera-app package from universe (I have 2.9.1+14.04.20140331-0ubuntu1)
  3) Launch the camera app
  4) Touch once inside the camera-app window
  5) Use the touchscreen to drag the camera-app window

  Expected results:
  You can move the camera-app window using the touchscreen

  Actual results:
  You cannot move the camera-app window, or perform any other touch tasks in unity, with the touchscreen

  This only affects touchscreen input - mouse/touchpad input is not
  affected

  This affects all apps written with the SDK (I tried camera-app,
  gallery-app, reminders-app). It's 100% reproducible.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity 7.2.0+14.04.20140411-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu2
  Architecture: amd64
  CompizPlugins: [core,commands,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
  CurrentDesktop: Unity
  Date: Mon Apr 14 14:59:09 2014
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-precise-amd64-20130203-1
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2013-12-02 (132 days ago)
  InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20130203-13:50
  SourcePackage: unity
  UpgradeStatus: Upgraded to trusty on 2014-02-12 (61 days ago)

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