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<body><span class="vcard"><a class="email" href="mailto:peter.hutterer@who-t.net" title="Peter Hutterer <peter.hutterer@who-t.net>"> <span class="fn">Peter Hutterer</span></a>
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<a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - Two finger scrolling isn't smooth"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89683">bug 89683</a>
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<td>jwrdegoede@fedoraproject.org
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<b><a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - Two finger scrolling isn't smooth"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89683#c9">Comment # 9</a>
on <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - Two finger scrolling isn't smooth"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89683">bug 89683</a>
from <span class="vcard"><a class="email" href="mailto:peter.hutterer@who-t.net" title="Peter Hutterer <peter.hutterer@who-t.net>"> <span class="fn">Peter Hutterer</span></a>
</span></b>
<pre>ok, had a look through the recordings and they indeed show the same symptoms.
in between normal-ish events there are events that cancel each other out.
That's most pronounced in the last recording.
This is related to the device being a semi-mt. Those devices only provide a
bounding box and if you check the center of the bounding box you can see
exactly those jumps:
Touch 0: 0/222
Touch 1: 300/258
Bounding box: 0/222... 300/258
center: 150/240
Touch 0: 0/226
Touch 1: 300/254
Bounding box: 0/226... 300/254
center: 150/240
Touch 0: 0/231
Touch 1: 300/249
Bounding box: 0/231... 300/249
center: 150/240
Touch 0: 0/235
Touch 1: 300/245
Bounding box: 0/235... 300/245
center: 150/240
Touch 0: 0/239
Touch 1: 300/241
Bounding box: 0/239... 300/241
center: 150/240
Touch 0: 0/243
Touch 1: 300/237
Bounding box: 0/237... 300/243
center: 150/240
Touch 0: 0/247
Touch 1: 300/293
Bounding box: 0/247... 300/293
center: 150/270
Touch 0: 0/251
Touch 1: 300/289
Bounding box: 0/251... 300/289
center: 150/270
I honestly don't know how to fix this though.</pre>
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