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<b><a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - Palm detection misses"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93947#c20">Comment # 20</a>
on <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - Palm detection misses"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93947">bug 93947</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>We found pressure too unreliable for detecting palms. pressure on a touchpad
isn't measured as a force but rather as a function of the surface area (as you
press down, your finger flattens and gets bigger). That means that the pressure
for a palm in the middle of the touchpad can be huge, but a palm at the edge of
the touchpad, when half the palm is off the touchpad, can look like a normal
finger. And many palm touches are a light touch only and are indistinguishable
from a finger interaction.
All that assumes that the touchpad reports pressure. Your's doesn't, which
makes it even harder :)</pre>
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