touchpad: require at least 3 events before enabling trackpoint palm detection
Some trackpoints, notably the one on the Lenovo T460s have a tendency to send the odd event even when they're not actually used. Trackpoint events trigger palm detection (see 0210f1fe) and thus effectively disable the touchpad, causing the touchpad to appear nonresponsive. Fix this by requiring at least 3 events from a trackpoint before palm detection is enabled. For normal use it's hard enough to trigger a single event anyway so this should not affect the normal use-case. https://bugzilla.redhat.com/show_bug.cgi?id=1364850 Signed-off-by:Peter Hutterer <peter.hutterer@who-t.net> Reviewed-by:
Hans de Goede <hdegoede@redhat.com> (cherry picked from commit 416fa44d)
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