same issue here with the 1420n, my xorg.conf sysnaptics input devices
section
Section "InputDevice"
Identifier "Synaptics Touchpad"
Driver "synaptics"
Option "SendCoreEvents" "true"
Option "Device" "/dev/psaux"
Option "Protocol" "auto-dev"
Option "HorizScrollDelta" "50"
Option "SHMConfig" "on"
EndSection
Going to VT and the back to X it works again. This is an really annoying
issue.
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Scroll of synaptics touchpad stop working suddenly
https://bugs.launchpad.net/bugs/125670
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