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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Can't manage acceleration profile on HP 255 G5 "SynPS/2 Synaptics TouchPad""
href="https://bugs.freedesktop.org/show_bug.cgi?id=99695#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Can't manage acceleration profile on HP 255 G5 "SynPS/2 Synaptics TouchPad""
href="https://bugs.freedesktop.org/show_bug.cgi?id=99695">bug 99695</a>
from <span class="vcard"><a class="email" href="mailto:giuseppemargarita@gmail.com" title="giuseppemargarita@gmail.com">giuseppemargarita@gmail.com</a>
</span></b>
<pre>(In reply to Peter Hutterer from <a href="show_bug.cgi?id=99695#c2">comment #2</a>)
<span class="quote">> touchpads don't have configurable acceleration profiles, so the option being
> ignored is expected.
>
> as for pointer movement: the pointer should stay "attached" to your finger
> for all but quite fast movement. i.e. a movement of ca 30mm on the touchpad
> should result in a movement of ca 30mm on the screen. is that not the case?</span >
That's not the case. When I reach the target sometimes I need to correct the
position by a small movement, but most of the time this occurs the pointer
moves too fast and the target is exceeded/overtaken. That's not the behavior I
expect and this issue is not present in synaptics. I don't know why, maybe
because synaptics has more configurable options like noise cancelation or
deceleration factor added to acceleration speed.
Can't you introduce acceleration profiles flat/adaptive for my touchpad in
libinput? I would try to use flat profile and see if it will resolve this
issue.
In the current behavior I feel a certain acceleration when I move my finger
fast and longer and that's not a problem. The only problem is when I move my
finger shorter and it seems that acceleration gives the pointer a boost which
overtakes the target.
Thanks and sorry if my English is bad, I'm from Italy.</pre>
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