https://bugs.freedesktop.org/show_bug.cgi?id=96409
Peter Hutterer <[email protected]> changed:
What |Removed |Added
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CC| |[email protected]
Status|NEW |ASSIGNED
--- Comment #5 from Peter Hutterer <[email protected]> ---
basic problem: BTN_TOUCH is sent by the touchpad regardless of the pressure
(afaict). That causes libinput to assume that there is a finger on the
touchpad.
we change this to support hovering, but that means we need a pressure threshold
and they are notoriously had to get right and we don't have the hooks for this
in libinput just yet.
from what I can tell by looking at your recordings:
no pressure: max 69
low pressure: max 108
normal pressure: max 156
high pressure: max 172
but there's a fair bit of overlap. I suspect the magic point is around the 100
mark.
The ABS_MT_WIDTH_MAJOR/MINOR is effectively useless, the touches are all in the
20-23mm mark. No pressure has a few in the 18-19 mark but there's at least one
with 24x22mm in there (which is more than any of the high-pressure ones)
ABS_MT_TOUCH_MAJOR/MINOR may be useful, but I have yet to figure out what those
numbers mean, they are always a bit random
so to get anywhere here, we'd need a lower pressure threshold to support
hovering on these devices.
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