https://bugs.freedesktop.org/show_bug.cgi?id=94989
--- Comment #18 from Michael Biebl <[email protected]> ---
running touchpad-edge-detector, I get
$ sudo touchpad-edge-detector /dev/input/event5
Touchpad SynPS/2 Synaptics TouchPad on /dev/input/event5
Move one finger around the touchpad to detect the actual edges
Kernel says: x [1472..5472], y [1408..4448]
Touchpad sends: x [1316..5626], y [1355..4826] \^C
Touchpad size as listed by the kernel: 53x23mm
Calculate resolution as:
x axis: 4000/<width in mm>
y axis: 3040/<height in mm>
Suggested udev rule:
# <Laptop model description goes here>
evdev:name:SynPS/2 Synaptics
TouchPad:dmi:bvnLENOVO:bvr8DET72WW(1.42):bd02/18/2016:svnLENOVO:pn42914CG:pvrThinkPadX220:rvnLENOVO:rn42914CG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:*
EVDEV_ABS_00=1316:5626:<x resolution>
EVDEV_ABS_01=1355:4826:<y resolution>
EVDEV_ABS_35=1316:5626:<x resolution>
EVDEV_ABS_36=1355:4826:<y resolution>
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