Created attachment 130963 [details] evemu-record /dev/input/event5 I'm currently trialling Gnome 3.24 on Ubuntu 17.04 and Wayland. I find libinput to work really well on my mouse, but the touchpad seems to have some input lag (can't quite quantify how much, maybe 100ms), just about enough to throw me off when trying to reach stuff like buttons, links, window borders etc. Essentially I always overshoot. This doesn't seem to happen with the mouse, as said earlier. I'm attaching the required diagnostic dumps below. Ubuntu 17.04, libinput10 1.6.3-1ubuntu1 amd64, libwayland-(bin|client0|cursor0) 1.12.0-1 amd64. Laptop is a Fujitsu A544.
Created attachment 130964 [details] /sys/class/dmi/id/modalias
Created attachment 130965 [details] udevadm info /sys/class/input/event5
I forgot to add, touchpad dimensions are 109x70mm
Also, kernel 4.10.0-19-generic #21-Ubuntu SMP
I'm going to assume that this is this gnome issue: https://bugzilla.gnome.org/show_bug.cgi?id=745032
*** Bug 100705 has been marked as a duplicate of this bug. ***
Peter, it's not the same problem at all.
hmm, true, sorry, didn't read properly. If you debug this with the in-tree event-gui, do you still see the issue there? Just trying to rule out any userspace stuff. Is this something new, i.e. did it work better with previous libinput versions, or previous wayland versions, or did it work with the same libinput under Xorg?
This is the first time I've used both Wayland or libinput at all I'm afraid, I belong to the hordes of panicking Unity users looking about for an alternative. I'll come back shortly after I test separately wayland/libinput on event-gui and x/libinput.
any updates?
Apologies Peter, I just came back yesterday from annual leave. I'll try run these tests over the weekend and report back.
Peter, I've switched X to use libinput and tested about on Unity, Gnome and XFCE for good measure. There's no lag to speak of with these combinations. It seems to be restricted to wayland + libinput.
You did use the xf86-input-libinput driver under xorg, did you? Because if so, then that would indicate a gnome bug, possibly https://bugzilla.gnome.org/show_bug.cgi?id=745032
ping?
Hi Peter, Yes, indeed using the xserver-xorg-input-libinput driver in X. That's definitely not the same bug. I'm experiencing no jerkiness or otherwise in touchpad action, only a slight lag and only on the touchpad - indeed, if I simply reach for the mouse that works fine.
Any chance you can try the latest libinput (1.9.4). That has the hysteresis removed and should provide more responsive slow motion.
Duplicate of bug 98839. Not having enough precision to "reach stuff like buttons, links, window borders etc" is fixed with bug 98839, due for release in libinput 1.10.
Closing as dupe of 98839, note that while some patches are in 1.10, there are extra fixes on master to improve that, specifically 6936a1555 and 400aadd53ac0. *** This bug has been marked as a duplicate of bug 98839 ***
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