<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <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#c5">Comment # 5</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 <a class="email" href="mailto:peter.hutterer@who-t.net" title="Peter Hutterer <peter.hutterer@who-t.net>"> Peter Hutterer</a> <pre>(In reply to giuseppemargarita from <a href="show_bug.cgi?id=99695#c4">comment #4</a>) > 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. which ones of those did you actually configure though? just because libinput doesn't have an option doesn't mean it doesn't exist, e.g. the noise cancellation in libinput is basically the same as synaptics. as for the actual speed, it's a bit hard to figure out what synaptics does... > 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. the current profile is the 'adaptive' profile, same as the mouse profile. You can quite easily hack the source to use the flat profile instead but tbh I doubt that's the behaviour you want either. > 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. the question is *why* this happens, since the acceleration itself should be the same on any device, regardless of the resolution. So far I only found a possible issue with the sampling rate but yours is within the same range as my touchpad here, so shouldn't be affected by that. Any help in identifying why your touchpad appears to accelerate when it shouldn't would be appreciated.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>