[Wayland-bugs] [Bug 101139] Acceleration still too slow with medium finger movements

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101139

Peter Hutterer <peter.hutterer at who-t.net> changed:

           What    |Removed                     |Added
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                 CC|                            |peter.hutterer at who-t.net

--- Comment #9 from Peter Hutterer <peter.hutterer at who-t.net> ---
Thanks for the patch greg, sorry about the delay. I tried this on top of
43de03a08c7cdbe on the t440s that I have here and, well, it's almost unusable,
sorry. On the default 0 setting it's way too fast, reducing it to -0.75 like
Nate makes very slow to slow movements almost match the finger movements. but
as soon as I go past that basic speed, the cursor is unpredictable and lands in
the screen edges almost immediately. 

I printed the curve (./build/ptraccel-debug --filter=touchpad --mode=accel,
then use the gnuplot commands at the top of the output) and it's no surprise
that it feels fast. The max accel factor is 9 (vs ~3 in the current code) and
the increase is sooner and much steeper than the current code. So at least the
fast movement isn't some weird side-effect but the intention.

So we definitely need some tuning here. Or am I missing something? I only
applied the patch from comment 7 locally.

And if that's it, I *really* wonder where the bug is because it's one thing to
argue about a personal preference for pointer feel but another to see that code
that *should* be device-independent behaves so different on different devices.
There's a bug in the accel code somewhere but I don't know where.

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