https://bugs.freedesktop.org/show_bug.cgi?id=93947
--- Comment #20 from Peter Hutterer <[email protected]> ---
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 :)
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