I found some useful info
here:https://bugzilla.kernel.org/show_bug.cgi?id=208547
** Bug watch added: Linux Kernel Bug Tracker #208547
https://bugzilla.kernel.org/show_bug.cgi?id=208547
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** Description changed:
touchpad not detected
ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: linux-image-5.8.0-26-generic 5.8.0-26.27
ProcVersionSignature: Ubuntu 5.8.0-26.27-generic 5.8.14
Uname: Linux 5.8.0-26-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia