Syncing task from Mir.

** Changed in: mir (Ubuntu)
   Importance: Undecided => Low

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https://bugs.launchpad.net/bugs/1421503

Title:
  [wacom] Pen pressure is a little erratic

Status in Mir:
  New
Status in mir package in Ubuntu:
  New

Bug description:
  On a wacom sensor (ThinkPad X220T), I can paint in
  mir_demo_client_fingerpaint using the stylus/pen (and its eraser).
  Weirdly though the pen tip seems to only alternate between all-on and
  all-off. Meanwhile painting with the larger softer eraser end gives me
  a nice wide range of pressure visible in the fingerpaint demo as
  opacity.

  I'm wondering if we're processing the "pressure" value incorrectly, or
  if this is just an unavoidable hardware issue.

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