Touchpad SynPS/2 Synaptics TouchPad on /dev/input/event12
Move one finger around the touchpad to detect the actual edges
Kernel says:	x [1250..5631], y [1205..4834]
Touchpad sends:	x [1250..5631], y [1197..4834] -^C

Touchpad size as listed by the kernel: 74x44mm
User-specified touchpad size: 76x45mm
Calculated ranges: 4381/3637

Suggested udev rule:
# Lenovo Thinkpad W530
evdev:name:SynPS/2 Synaptics TouchPad:dmi:bvnLENOVO:bvrG5ETA5WW(2.65):bd03/04/2016:svnLENOVO:pn2447GZ2:pvrThinkPadW530:rvnLENOVO:rn2447GZ2:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:*
 EVDEV_ABS_00=1250:5631:58
 EVDEV_ABS_01=1197:4834:81
 EVDEV_ABS_35=1250:5631:58
 EVDEV_ABS_36=1197:4834:81