[Wayland-bugs] [Bug 100463] Unusable pressure values on ETPS/2 Elantech Touchpad

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100463

cp at corradoprimier.it changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|FIXED                       |---
             Status|RESOLVED                    |REOPENED

--- Comment #25 from cp at corradoprimier.it ---
Reopening. I can confirm this is still happening on my Samsung 870Z5G with Arch
Linux and an Elantech touchpad, and it is definitely version-related.

While I was on 1.6.3 everything worked fine, but on both 1.7 and 1.8 the
touchpad is unusable. I am currently using libinput 1.8.0.

I fixed it by following the instructions at
https://wayland.freedesktop.org/libinput/doc/latest/touchpad_pressure.html with
the values found by Paul. I created /etc/udev/hwdb.d/99-touchpad-pressure.hwdb
containing:

svnSAMSUNGELECTRONICSCO.,LTD.:pn870Z5G/880Z5F
 LIBINPUT_ATTR_PRESSURE_RANGE=10:8

After a Wayland restart everything works again.

Combinations I tested:
libinput <= 1.6.3 + kernel < 4.12 -> ok
libinput <= 1.6.3 + kernel >= 4.12 -> touchpad not responding
libinput == 1.7.x + kernel == 4.11 -> bad pressure values
libinput == 1.8.0 + kernel == 4.11 -> bad pressure values
libinput == 1.8.0 + kernel == 4.11 + pressure fix -> ok

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