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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Add support for disabling hysteresis"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93503#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Add support for disabling hysteresis"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93503">bug 93503</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>I ran some analysis on <span class=""><a href="attachment.cgi?id=120684" name="attach_120684" title="Finger rolling to move the cursor a bit">attachment 120684</a> <a href="attachment.cgi?id=120684&action=edit" title="Finger rolling to move the cursor a bit">[details]</a></span> and it worries me a bit:
Touchpad dimensions: 101x56mm
Touchpad diagonal: 1393.22 (0.25 == 348.30)
Touchpad diagonal: 116.10mm (0.25 == 29.03mm)
48 deltas, average 0.12, max 0.12, total distance 5.66 in mm
... x: average 0.08mm, max 0.08mm, total distance 4.00mm
... y: average 0.08mm, max 0.08mm, total distance 4.00mm
Maximum recorded delta: 0.12mm
... x: 0.08mm
... y: 0.08mm
source:
<a href="https://github.com/whot/input-data-analysis/tree/master/touchpad-max-delta">https://github.com/whot/input-data-analysis/tree/master/touchpad-max-delta</a>
So while you move just over 5mm in total, your average delta is 0.12mm which is
1 device unit in any direction. I'm very hesitant to disable the hysteresis for
a movement of that extent, because we're dealing with motions so small that
it's impossible to tell intentional movement from accidental movement or hw
sensor inefficiency.</pre>
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