You're right, if freezes by just holding your palm on the border of the
screen. I updated the description.

** Changed in: unity8 (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1614163

Title:
  unity8 stops processing touch input events after holding the palm for
  a few seconds on the screen

Status in Canonical System Image:
  Confirmed
Status in unity8 package in Ubuntu:
  Confirmed

Bug description:
  current build number: 403
  device name: arale
  channel: ubuntu-touch/rc-proposed/meizu.en

  Test Case:
  1. Boot the phone and unlock it
  2. hold your palm on the border of the screen for several seconds (I'm on the 
application scope by default)
  3. Scroll the page up and down

  Expected result
  Scrolling works as expected, page goes up/down

  Actual result
  The dash is like frozen. A right edge swipe works and clears the problem up.

  The following records are logged in unity8.log

  [...]
  [2016-08-17:18:18:37.829] qtmir.sensor: Screen::onOrientationReadingChanged
  [2016-08-17:18:18:37.832] qtmir.sensor: Screen::customEvent - new orientation 
8 handled
  [2016-08-17:18:18:39.119] qtmir.sensor: Screen::onOrientationReadingChanged
  [2016-08-17:18:18:39.122] qtmir.sensor: Screen::customEvent - new orientation 
1 handled
  [2016-08-17:18:18:54.957] qtmir.surfaces: MirSurfaceItem(unity8-dash) - Got a 
QEvent::TouchBegin while there's still an active/unfinished touch sequence.
  [2016-08-17:18:20:42.033] qtmir.sensor: Screen::onOrientationReadingChanged
  [2016-08-17:18:20:42.036] qtmir.sensor: Screen::customEvent - new orientation 
8 handled
  [2016-08-17:18:20:42.849] qtmir.sensor: Screen::onOrientationReadingChanged
  [2016-08-17:18:20:42.853] qtmir.sensor: Screen::customEvent - new orientation 
1 handled

  <Here I do a right edge swipe>

  [2016-08-17:18:20:45.100] qtmir.surfaces: 
MirSurface[0x1670f10,"unity8-dash"]::updateActiveFocus() unfocused
  [2016-08-17:18:20:45.217] [PERFORMANCE]: Last frame took 89 ms to render.
  [2016-08-17:18:20:45.295] [PERFORMANCE]: Last frame took 35 ms to render.
  [2016-08-17:18:20:46.037] [PERFORMANCE]: Last frame took 88 ms to render.
  [2016-08-17:18:20:46.271] qtmir.surfaces: 
MirSurface[0x1670f10,"unity8-dash"]::updateActiveFocus() focused
  [2016-08-17:18:20:46.298] qtmir.clipboard: D-Bus GetContents - returning 0 
bytes

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