touchpad: disable MT for elantech semi-mt touchpads
When three fingers are set down on the touchpad, one finger tends to get a 0/0 coordinate, triggering palm detection in the upper left corner. Handle this like the jumping semi-mt touchpads and disable MT handling and instead just rely on the x/y axis and the BTN_TOOL_* events. https://bugs.freedesktop.org/show_bug.cgi?id=93583 This kernel patch is required: https://lkml.org/lkml/2016/1/11/171 Signed-off-by:Peter Hutterer <peter.hutterer@who-t.net> Reviewed-by:
Hans de Goede <hdegoede@redhat.com>