[Wayland-bugs] [Bug 101670] Pressure sensitivity calibrated value for ALPS touchpad on Dell Latitude E6220

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101670

            Bug ID: 101670
           Summary: Pressure sensitivity calibrated value for ALPS
                    touchpad on Dell Latitude E6220
           Product: Wayland
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: ckoresko at atlanticbb.net

After testing with libinput 1.7.3 (from Fedora 26 beta) on Fedora 25, I have
determined the following touch pressure values to work well with the ALPS
touchpad on the Latitude E6220.

The contents of /etc/udev/hwdb.d/71-touchpad-local.hwdb are:
  libinput:name:*AlpsPS/2 ALPS GlidePoint:dmi:*
   LIBINPUT_ATTR_PRESSURE_RANGE=103:100

Without this entry in /etc/udev/hwdb.d/71-touchpad-local.hwdb the touchpad is
almost unusable due to excessive sensitivity (it responds with mouse movements
even when the finger is held above the surface, so the mouse moves as the
finger approaches and departs the sruface).  With this setting the behavior is
as expected.

The dimensions of the exposed surface of this touchpad are approximately 80x40
mm.

The output from udevadm info --query=all is:

  /dev/input/event5
  P: /devices/platform/i8042/serio1/input/input6/event5
  N: input/event5
  E: DEVNAME=/dev/input/event5
  E: DEVPATH=/devices/platform/i8042/serio1/input/input6/event5
  E: ID_BUS=i8042
  E: ID_INPUT=1
  E: ID_INPUT_TOUCHPAD=1
  E: ID_INPUT_TOUCHPAD_INTEGRATION=internal
  E: LIBINPUT_ATTR_PRESSURE_RANGE=103:100
  E: LIBINPUT_DEVICE_GROUP=11/2/8/300:isa0060/serio1
  E: LIBINPUT_MODEL_ALPS_TOUCHPAD=1
  E: LIBINPUT_MODEL_FIRMWARE_VERSION=300
  E: MAJOR=13
  E: MINOR=69
  E: SUBSYSTEM=input
  E: USEC_INITIALIZED=4392877

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