** Description changed:

+ 
  Touch screen and touchpad lost click function after quickly tapped dash
- home repeatly by touch screen
+ home repeatly by touch screen, Installed 14.04, still have same issue.
+ 
+ Quickly tapped dash home more than three times by touch screen.Found
+ touch screen and touchpad lost click function.
+ 
+ Note:
+ 1.When this issue occured, cursor still can be moved by touch screen/touchpad.
+ 2.When this issue occured ,click/double click by touch screen/touchpad,left 
click/right click by touchpad all were not workable.
+ 
+ Steps to Reproduce:
+ 1.install 12.04.4 image or 14.04 image, boot into Ubuntu OS.
+ 2.Quickly tapped dash home more than three times by touch screen.
+ 3.Found touch screen and touchpad lost click function.
+ 
+ This bug is reported from private OEM project, also check
+ https://launchpad.net/bugs/1297067
+ 
+ ======
+ 
+ using xinput --query-state can actually see the button press event
+ 
+ ⎡ Virtual core pointer id=2   [master pointer (3)]
+ ⎜ ↳ Virtual core XTEST pointer id=4   [slave pointer (2)]
+ ⎜ ↳ syntp id=6        [slave pointer (2)]
+ ⎜ ↳ ELAN Touchscreen id=11    [slave pointer (2)]
+ 
+ #xinput --query-state 11
+ 2 classes :
+ ButtonClass
+  button[1]=up
+  button[2]=up
+  button[3]=up
+  button[4]=up
+  button[5]=up
+ ValuatorClass Mode=Absolute Proximity=In
+  valuator[0]=398
+  valuator[1]=1652
+  valuator[2]=5
+  valuator[3]=3
+  valuator[4]=0
+  valuator[5]=399
+  valuator[6]=1653
+ 
+ #xinput --query-state 6
+ 2 classes :
+ ButtonClass
+  button[1]=down
+  button[2]=up
+  button[3]=up
+  button[4]=up
+  button[5]=up
+  button[6]=up
+  button[7]=up
+  button[8]=up
+ ValuatorClass Mode=Relative Proximity=In
+  valuator[0]=1
+  valuator[1]=394
+ 
+ touchpad's button and touchpanel's
+ valuator[2] and valuator[3] will changed after we press the button (or 
monitor)
+ 
+ Also I found press "super" on keyboard will recover the
+ touchscreen/touchpad loss.
+ 
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: unity 5.20.0-0ubuntu3
  ProcVersionSignature: Ubuntu 3.11.0-18.32~precise1-generic 3.11.10.4
  Uname: Linux 3.11.0-18-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.6
  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]
  Date: Mon Apr 21 16:50:04 2014
  DistributionChannelDescriptor:
-  # This is a distribution channel descriptor
-  # For more information see 
http://wiki.ubuntu.com/DistributionChannelDescriptor
-  canonical-oem-stella-daan2-precise-amd64-20140416-1
+  # This is a distribution channel descriptor
+  # For more information see 
http://wiki.ubuntu.com/DistributionChannelDescriptor
+  canonical-oem-stella-daan2-precise-amd64-20140416-1
  InstallationMedia: Ubuntu 12.04 "Precise" - Failed to find casper uuid.conf 
in 'binary/casper/initrd.img-3.11.0-18-generic.old-dkms' LIVE Binary 
20140416-06:52
  MarkForUpload: True
  ProcEnviron:
-  LANGUAGE=en_US:
-  TERM=xterm
-  PATH=(custom, no user)
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  LANGUAGE=en_US:
+  TERM=xterm
+  PATH=(custom, no user)
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1310518

Title:
  Touch screen and touchpad lost click function after quickly tapped
  dash home repeatly by touch screen

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