Hi,
On 12-06-15 08:09, Peter Hutterer wrote:
Some touchpads, e.g. the Cyapa in the Acer c720 have a small axis range
([0, 870], [0, 470]), so the diagonal/magic value yields a hysteresis margin
of 1 device unit. On that device, that's one-tenth of a millimeter, causing
pointer motion just by holding the finger.
For touchpads that provide a physical resolution, set the hysteresis axes to
0.5mm and do away with the magic factor.
https://bugzilla.redhat.com/show_bug.cgi?id=1230441
Signed-off-by: Peter Hutterer <peter.hutte...@who-t.net>
Yes I think this is a good idea:
Reviewed-by: Hans de Goede <hdego...@redhat.com>
Can you also ask the reporter of:
https://bugs.freedesktop.org/show_bug.cgi?id=90590
To test libinput/master once you've pushed this? It will likely
help with his problem too.
Regards,
Hans
---
src/evdev-mt-touchpad.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/src/evdev-mt-touchpad.c b/src/evdev-mt-touchpad.c
index 8c28ff7..e9870ad 100644
--- a/src/evdev-mt-touchpad.c
+++ b/src/evdev-mt-touchpad.c
@@ -1495,10 +1495,18 @@ tp_init(struct tp_dispatch *tp,
EV_ABS,
ABS_MT_DISTANCE);
- tp->hysteresis_margin.x =
- diagonal / DEFAULT_HYSTERESIS_MARGIN_DENOMINATOR;
- tp->hysteresis_margin.y =
- diagonal / DEFAULT_HYSTERESIS_MARGIN_DENOMINATOR;
+ if (device->abs.fake_resolution) {
+ tp->hysteresis_margin.x =
+ diagonal / DEFAULT_HYSTERESIS_MARGIN_DENOMINATOR;
+ tp->hysteresis_margin.y =
+ diagonal / DEFAULT_HYSTERESIS_MARGIN_DENOMINATOR;
+ } else {
+ int res_x = tp->device->abs.absinfo_x->resolution,
+ res_y = tp->device->abs.absinfo_y->resolution;
+
+ tp->hysteresis_margin.x = res_x/2;
+ tp->hysteresis_margin.y = res_y/2;
+ }
if (tp_init_accel(tp, diagonal) != 0)
return -1;
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