I had similar issue on my HP laptop with elantech trackpad, where
trackpad would not be responsive immediately after login. The buttons
would still work, external (USB) mouse would also work.
In my case the fix was to remove synaptics driver and let libinput
handle trackpad.
sudo apt remove xserver-xorg-input-synaptics
sudo apt install xserver-xorg-input-libinput
I also created a symlink for 40-libinput.conf in /etc/X11/xorg.conf.d
although it may not be needed (not present in UM 20.04).
sudo mkdir -p /etc/X11/xorg.conf.d
sudo ln -s /usr/share/X11/xorg.conf.d/40-libinput.conf /etc/X11/xorg.conf.d/
A reboot was required for changes to take place properly.
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https://bugs.launchpad.net/bugs/1900168
Title:
touchpad motion stops responding sporadically in 20.10 mate beta
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