touchpad: increase the jump detection interval to 30ms

On serial touchpads it's common enough that frames slow down tofrom the usual
12ms to 24ms. That's too close to our 25ms cutoff so if we have a minor delay,
we end up missing out on jump detection.

Fixes #541

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

diff --git a/src/evdev-mt-touchpad.c b/src/evdev-mt-touchpad.c
index 1608e7934179354ad30a62833ee3c79a6b93ee9e..56ab2ca6ace056f23959cfc72316b9d9c7c7cadd 100644 (file)
--- a/src/evdev-mt-touchpad.c
+++ b/src/evdev-mt-touchpad.c
@@ -1534,10 +1534,10 @@ tp_detect_jumps(const struct tp_dispatch *tp,
        if (tp->device->model_flags & EVDEV_MODEL_TEST_DEVICE)
                reference_interval = tdelta;
 
-       /* If the last frame is more than 25ms ago, we have irregular
+       /* If the last frame is more than 30ms ago, we have irregular
         * frames, who knows what's a pointer jump here and what's
         * legitimate movement.... */
-       if (tdelta > 2 * reference_interval || tdelta == 0)
+       if (tdelta > 2.5 * reference_interval || tdelta == 0)
                return false;
 
        /* We historically expected ~12ms frame intervals, so the numbers