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: [email protected]
Reporter: [email protected]
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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