The touchpad on Lenovo P50 is very stuttery and a pain to use. The following kernel patch fixes the issue: https://lore.kernel.org/linux-input/20200312031422.GA1823643@jelly/T/ See https://gitlab.freedesktop.org/libinput/libinput/issues/448 as well.
The fix for this has been queued up here: https://git.kernel.org/pub/scm/linux/kernel/git/dtor/input.git/log/?h=for-linus So it should show up in the next 5.6-rc# without us needing to backport it.
The fix for this has landed in Linus' tree, so this should be fixed on the next git-snapshot or rc release of the kernel in F32.
As expected an update fixing this is on its way to the updates-testing repo, this issue is being tracked in more detail in bug 1814872, marking this one as a duplicate. *** This bug has been marked as a duplicate of bug 1814872 ***