[Wayland-bugs] [Bug 106141] Thinkpad X240 touchpad movement is jumpy and extremely imprecise

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106141

abdulkadirfsanli at gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|https://bugzilla.redhat.com |https://bugzilla.redhat.com
                   |/show_bug.cgi?id=1569692    |/show_bug.cgi?id=1264453

--- Comment #19 from abdulkadirfsanli at gmail.com ---
I just realized something. Remember when I said on some boots the trackpad is
silky smooth with libinput, maybe 1/10 times? Well it turns out when that type
of boot does occur, synaptics and libinput are absolutely smooth, libinput
doesn't have the huge saw tooth pattern and synaptics doesn't have the small
1-3 pixel one.

I am not sure what causes this problem. However, on the boots that do have the
jumpy cursor bug, synaptics seems to compensate for it with drastically less
acceleration, reducing it down to just a few pixel jumps. Your prediction about
acceleration was correct.

I also have a suspicion that, like previous users have reported, when the
touchpad firmware is updated to 8.1 from Windows, this bug occurs with Linux.
X220 and X240 users have reported the same behavior. I have both of those Red
Hat Bugzilla tickets linked in See Also.

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