Same issue. Lenovo Thinkpad X1. Looks like it started with kernel version
5.4.0-45 and remains in 5.4.0-47. With 5.4.0-42 trackpad is listed as
↳ SynPS/2 Synaptics TouchPad
in xinput, with 5.4.0-45 and 5.4.0-47 it shows as
↳ Synaptics TM3418-002
according to Xorg.0.log same driver is loaded in 5.4.0-{42,45,47}
LoadModule: "synaptics"
(II) Loading /usr/lib/xorg/modules/input/synaptics_drv.so
but neither the touchpad, the touchpad buttons, nor the trackpoint work.
But "synclient" sees the trackpad and prints out all the properties.
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https://bugs.launchpad.net/bugs/1895202
Title:
touchpad suddenly not detected, appearing as PS/2 mouse in devices
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