https://bugs.freedesktop.org/show_bug.cgi?id=103619
--- Comment #10 from Daniel van Vugt <daniel.van.v...@canonical.com> ---
Zach,
Please log a new bug for that:
https://bugs.freedesktop.org/enter_bug.cgi?product=wayland&component=libinput
Philipp,
I'm afraid to tell you that after fixing bug 98839, the remaining problems with
the X1 Carbon gen 4/5 are mostly hardware problems. It's just laggy
hardware/firmware. I have verified this myself on both models, and that gen 3
has no such problem, and that many other laptops have no such problem. Only the
gen 4
and gen 5 X1 Carbon's have laggy touchpad hardware. I know it's very
disappointing.
Slightly encouraging is that in mouse emulation mode (single point support),
the lag is gone. I don't know how to achieve this in Linux but it's visible
during Windows 10 setup. The lag returns after the OS installs multi-touch
support. So the lag sounds like it's rooted in the touchpad firmware for
multi-touch support.
There is only one remaining software fix I can think of that might/should
help you. That is to switch to the 'flat' acceleration profile:
https://wayland.freedesktop.org/libinput/doc/latest/pointer-acceleration.html
However I don't know of any way for regular users to do that.
Failing a profile change, this bug is a pure duplicate of bug 98839, plus
hardware/firmware faults.
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