tree 0f5399fbb70db1fdbb61b41fe55e159b5d4a96c6
parent f7a00485784f1d159ae86492d70bd599e4389b2a
author Harry Pan <harry.pan@intel.com> 1489654666 +0800
committer chrome-bot <chrome-bot@chromium.org> 1489758558 -0700

Snappy: Mitigate involuntary input of touchpad

Snappy design has mechanic issue around the touchpad:
Namely hold the device and shake it intensively, it would
generate false input events, which potentially causes an
involuntary UI event from user's perspective.

In order to tackle this odd, we were suggested to follow
the CL:352860.

This patch diables "Zero Finger Clicks" for snappy to
mitigate ghost events; even click is reported physically,
the higher level gesture-interpreter will suppress it
so there will be no fingers action on the UI layer.

BUG=b:36018765
TEST='cros_workon-snappy start chromeos-base/gestures-conf'
     'emerge-snappy chromeos-base/gestures-conf'
     'cros deploy IP-of-DUT chromeos-base/gestures-conf'
      reboot to apply new cmt configuration onto device,
      intensively shake device while using online painting
      application such as 'https://sketch.io/sketchpad/'
      to examine its efficacy of supressing false event;
      Alternately, move mouse pointer over a clickable
      UI element while shaking device to examine.
      It is able to monitor low-level 'evtest' report in
      parallel to examime these involuntary clicks are
      successfully been suppressed.

Change-Id: Id19269ad96dab3afe8015487b9f514d4b170bf06
Signed-off-by: Harry Pan <harry.pan@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/456122
Commit-Ready: Harry Pan <harry.pan@intel.corp-partner.google.com>
Tested-by: Johnny Jiang <johnny.jiang@quanta.corp-partner.google.com>
Reviewed-by: Charlie Mooney <charliemooney@chromium.org>