Public bug reported:
The vertical sensitivity of the touchpad on my laptop Lenovo T490 seemed
significantly higher than the horizontal sensitivity. After doing some
research I found out that the touchpad size is incorrectly listed by the
kernel.
Touchpad size listed by the kernel: 77x107mm
The real size of the touchpad: 68x100mm
Description: Ubuntu 20.04.1 LTS
Release: 20.04
Systemd version: 245.4-4ubuntu3.2
Output from the touchpad-edge-detector:
miroslav@miroslav-ThinkPad-T490:~$ sudo touchpad-edge-detector 68x100
/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 [1266..5678], y [1162..4694]
Touchpad sends: x [1266..5678], y [1161..4694] -^C
Touchpad size as listed by the kernel: 77x107mm
User-specified touchpad size: 68x100mm
Calculated ranges: 4412/3533
Suggested udev rule:
# <Laptop model description goes here>
evdev:name:SynPS/2 Synaptics
TouchPad:dmi:bvnLENOVO:bvrN2IET75W(1.53):bd08/21/2019:svnLENOVO:pn20N2CTO1WW:pvrThinkPadT490:rvnLENOVO:rn20N2CTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone:*
EVDEV_ABS_00=1266:5678:65
EVDEV_ABS_01=1161:4694:35
EVDEV_ABS_35=1266:5678:65
EVDEV_ABS_36=1161:4694:35
** Affects: libinput (Ubuntu)
Importance: Undecided
Status: New
** Tags: touchpad
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https://bugs.launchpad.net/bugs/1896540
Title:
Incorrectly specified Touchpad size for Lenovo T490
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