<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - synaptics touchpad jitter" href="https://bugs.freedesktop.org/show_bug.cgi?id=95290#c8">Comment # 8</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - synaptics touchpad jitter" href="https://bugs.freedesktop.org/show_bug.cgi?id=95290">bug 95290</a> from <a class="email" href="mailto:liam@fightingcrane.com" title="liam@fightingcrane.com">liam@fightingcrane.com</a> <pre>Created <a href="attachment.cgi?id=123862" name="attach_123862" title="screencast of evemu-play with "another evemu scrolling jitter recording"">attachment 123862</a> <a href="attachment.cgi?id=123862&action=edit" title="screencast of evemu-play with "another evemu scrolling jitter recording"">[details]</a> screencast of evemu-play with "another evemu scrolling jitter recording" (In reply to Peter Hutterer from <a href="show_bug.cgi?id=95290#c7">comment #7</a>) > ok, I still don't know what exactly I'm supposed to be looking at here. > Let's make sure we don't clash in terminology terms: jitter means that the > pointer keeps moving even when the finger(s) is/are held still. jumps mean > that the pointer suddenly moves by a large amount. > > I didn't see any jitter in the recording of the still finger, usually we'll > see some pointer movement when a touchpad is jittery. > > In this recording I can see scroll events and I can see some small ca 1 > pixel up down movement after the button click event, but it's hard to tell > what the movement is supposed to be given the other movements in the event. > Also remember, I can only see the touchpad events, not your finger so it's > sometimes hard to tell what is intended and what isn't. > > So, I'm sorry but I'll need you to explain in detail what the bug is you're > seeing and when. And ideally produce an evemu-recording that isolates this > behaviour and has no or hardly any other events in it. I said this in the initial report: The trackpad passes along movement even when my fingers aren't moving. Depending on context,this manifests as either a jittery pointer (randomly hops about a, roughly, five square pixel area) or, when I've two fingers on the trackpad, it will randomly scroll by about the same amount as the pointer jitters. The issue with (two-finger) scrolling is analogous to the pointer jitter: when holding two fingers still on the trackpad, the page will move up and down a bit (again, it looks to be ABOUT -+5 pixels...on both the x and y axis if those freedoms are available). Now, I'd call that amount of movement jitter rather than jumps. If that doesn't explain the problem sufficiently, can you please tell me how you'd like it phrased? I spent quite a while reading about this before posting the bug so that: 1. it hadn't yet been reported (similar bugs have been reported, but not for this model trackpad), 2. you had all the information you needed (from <a href="https://wayland.freedesktop.org/libinput/doc/latest/reporting_bugs.html">https://wayland.freedesktop.org/libinput/doc/latest/reporting_bugs.html</a>). I'm attaching a screencast which plays back the recording called "another evemu scrolling jitter recording". I use two finger scroll twice. It's after the second scroll ends that you see a pretty substantial jitter (around the 6s mark and lasts for around 2s). I hope this helps.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>