NAME

       touchpad-edge-detector - print the axis ranges for a touchpad device

SYNOPSIS

       touchpad-edge-detector [--help] WxH /dev/input/eventX

DESCRIPTION

       The touchpad-edge-detector tool reads touchpad events from the kernel and records the minimum and maximum
       coordinates  based  on  user  input.  This is an interactive tool, the user must move a finger around the
       touchpad, attempting to trigger an event at all edges of the touchpad.

       To terminate the event collection and print a summary, press Ctrl+C. It is recommended that the  tool  is
       run several times to guarantee a reliable result.

OPTIONS

       WxH     The width and height of the touchpad in mm. For a touchpad 100mm wide and 75mm high, the argument
               is thus 100x75. This is a required argument.

       /dev/input/eventX
               The  event  node  of  the  touchpad  to  read  events from. A list of possible event nodes can be
               obtained with either one of the following commands: libinput  record,  evemu-record,  or  evtest.
               Alternatively   the   event   node   for   a   device   is   listed   in   the   Handlers=   line
               /proc/bus/input/devices.  This is a required argument.

       --help  Print a short help description

NOTES

       On completion, this tool prints a summary of the collected events and  a  suggested  udev  rule.  Due  to
       rounding  errors  it  is rare to get an exact match for the touchpad's dimensions, but any discrepancy of
       more than 5mm should be corrected with the suggested udev rule.

       The udev rule should be simplified  and  submitted  as  a  pull  request  to  the  system  repository  at
       https://github.com/systemd/systemd.       For       further       guidance,       see       the      file
       /usr/lib/udev/hwdb.d/60-evdev.hwdb.

SEE ALSO

       udev(7)

                                                                                       TOUCHPAD-EDGE-DETECTOR(1)