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touchpad: disable MT for elantech semi-mt touchpads

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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>
This commit is contained in:
Peter Hutterer 2016-01-12 12:24:18 +10:00
parent 41cc9053dd
commit 556aac04b5
1 changed files with 2 additions and 1 deletions
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3
src/evdev-mt-touchpad.c
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@ -1496,7 +1496,8 @@ tp_init_slots(struct tp_dispatch *tp,
* explanation.
*/
if (tp->semi_mt &&
(device->model_flags & EVDEV_MODEL_JUMPING_SEMI_MT)) {
(device->model_flags &
(EVDEV_MODEL_JUMPING_SEMI_MT|EVDEV_MODEL_ELANTECH_TOUCHPAD))) {
tp->num_slots = 1;
tp->slot = 0;
tp->has_mt = false;