Just upgraded to 20.10, same story. Works in discreet graphics mode but
is having hiccups - sometimes touchpad is not recognized, e.g. sometimes
on non-clean reboot, sometimes when reboot with external monitor
attached. Intermittent, clean reboot without attached peripherals seems
to always help.
There was a strong recommendation not to change "Hybrid" to "Discrete"
mode in BIOS - not sure if it is still a problem, just beware:
https://www.reddit.com/r/thinkpad/comments/a2g0k4/warning_do_not_change_from_hybrid_graphics_to/
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Have the same problems on p50 after installing NVIDIA-Linux-x86_64-440.64.
Linux 5.3.0-40-generic #32-Ubuntu SMP Fri Jan 31 20:24:34 UTC 2020
x86_64 x86_64 x86_64 GNU/Linux
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