<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - Somehow conditionalize hysteresis (hardware black/whitelist, device property introspection, user-exposed setting, etc)" href="https://bugs.freedesktop.org/show_bug.cgi?id=98839#c27">Comment # 27</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - Somehow conditionalize hysteresis (hardware black/whitelist, device property introspection, user-exposed setting, etc)" href="https://bugs.freedesktop.org/show_bug.cgi?id=98839">bug 98839</a> from <a class="email" href="mailto:daniel.van.vugt@canonical.com" title="Daniel van Vugt <daniel.van.vugt@canonical.com>"> Daniel van Vugt</a> <pre>I would like to help with this problem when I find time myself... It appears some common laptops like Lenovo X1 Carbon (gen4 and gen5) need at lot of work and are borderline unusable (<a href="https://bugs.launchpad.net/ubuntu/+source/libinput/+bug/1696929">https://bugs.launchpad.net/ubuntu/+source/libinput/+bug/1696929</a>) However having used the Xorg synaptics driver in the past I know half the problem is hysteresis, which needs to be turned off. The other half the problem seems to be a regression in Synaptics hardware/firmware after the gen3 X1 Carbon. Frankly, it's still laggy even without hysteresis, but at least becomes usable. Also, regarding "there's some other bug that snaps it to the axes"; yes, that's a visible problem. Drawing circles (not even tiny ones) on the touchpad results in the cursor moving in a square. It sounds to me like hysteresis has been implemented per-axis, when actually it might be better implemented in an omnidirectional fashion (one threshold, not one threshold per axis) using simple Pythagoras.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>