[Bug 262282] Framework laptop touchpad latency

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262282

--- Comment #12 from Vincent Milum Jr <freebsd@darkain.com> ---
I think part of the issue is just FreeBSD's underlaying touchpad code, not even
specific to this exact touchpad.

I have another laptop that has a 144Hz screen on it, but I noticed the touchpad
in FreeBSD was only polling at ~60Hz. When there is such a large discrepancy
between screen refresh rate and pointer polling, it becomes significantly more
noticeable.

Latency issue or not (I don't remember if that machine also had that issue),
due to the fact that there is mouse movement smoothing as well, multiple inputs
would need to be captured for the smoothing to kick in and then produce a
response back to the rest of the stack and ultimately the cursor update on
screen.

So the first two things I'd suggest investigating is the polling frequency and
the code used for cursor smoothing.

As an additional note: on that laptop with the 144Hz screen (some random Dell I
have), I tried tweeking the polling frequency directly in the driver it uses. I
could only push it as far as about 120Hz before input became entirely unstable.
I didn't really check into seeing if this was an issue with the hardware or
somewhere in the driver/kernel.

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