https://bugs.freedesktop.org/show_bug.cgi?id=106506
--- Comment #9 from Chow Loong Jin <[email protected]> ---
(In reply to Peter Hutterer from comment #8)
> urgh, really? that is terrible and would make it virtually impossible for
> libinput to ever do the right thing...
>
> Please re-confirm this though, just run the commands again. I find that I
> get quite different results every time I re-run-this and have to run it a
> few times in a row to get reliable readings.
Yeah the behaviour runs around a bit, but my results seem to be pretty
consistent. I just tried moving my pointer around each of my screens without
mode-switching, and got the following results:
Just the internal:
Average for abs deltas: x: 22 y: 14
Median for abs deltas: x: 18 y: 12
95% percentile for abs deltas: x: 62 y: 39
Just the external:
Average for abs deltas: x: 32 y: 19
Median for abs deltas: x: 30 y: 17
95% percentile for abs deltas: x: 80 y: 50
> You also said above:
> > A slow pointer makes me press harder.
>
> Please make sure you're not affected by the speed of the pointer motion on
> the screen. You may be inclined to push harder on the large screen to hit
> the edges, resulting in higher deltas. This could affect the input data.
I think that this is exactly what's happening, but it's also possible the the
firmware is sending larger inputs in response to longer straight movements.
> The instructions to hit the screen edges are just so users know what to
> roughly do, the tool isn't affected by the visible pointer movement at all -
> the trackpoint will keep sending events even when the pointer is at the
> screen edge.
With the test I just did in this post, I was roughly drawing large circles
touching the screen edges without bothering to hit the corners.
> > And perhaps you're used to hitting your trackpoint hard?
>
> I admit I only use the trackpoint to test things, I hardly ever use it
> directly. So I'm not sure what I'm used to and I definitely can't comment in
> regards to RSI etc. Which effectively means I'll question everything you
> tell me for basic sanity, but otherwise you'll have the last word on
> everything :)
:)
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