[Wayland-bugs] [Bug 105640] Lenovo T440p - slow fine touchpad movement makes cursor jump

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https://bugs.freedesktop.org/show_bug.cgi?id=105640

GitLab Migration User  changed:

   What|Removed |Added

 Resolution|--- |MOVED
 Status|NEEDINFO|RESOLVED

--- Comment #15 from GitLab Migration User  ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
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You can subscribe and participate further through the new bug through this link
to our GitLab instance:
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[Wayland-bugs] [Bug 105640] Lenovo T440p - slow fine touchpad movement makes cursor jump

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https://bugs.freedesktop.org/show_bug.cgi?id=105640

--- Comment #14 from Peter Hutterer  ---
You should try 1.11rc1, it has the new touchpad pointer accel with reduces the
basic speed. This should make the issue more-or-less disappear.

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[Wayland-bugs] [Bug 105640] Lenovo T440p - slow fine touchpad movement makes cursor jump

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=105640

Peter Hutterer  changed:

   What|Removed |Added

 Status|NEW |NEEDINFO

--- Comment #13 from Peter Hutterer  ---
Can you please verify that when you're using synaptics and reproducing these
jumps (i.e. moving very slowly) you can see those jumps, only they're a few
pixels only rather than the ones seen by libinput?

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[Wayland-bugs] [Bug 105640] Lenovo T440p - slow fine touchpad movement makes cursor jump

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https://bugs.freedesktop.org/show_bug.cgi?id=105640

--- Comment #12 from Peter Hutterer  ---
> (EE) event19 - Synaptics tm2964-001: kernel bug: Touch jump detected and 
> discarded.

Right, so this means even without the patch, libinput discards some jumping
motion.

> On Xorg with synaptics touchpad work perfectly.

tbh, I don't quite know how this could be, iirc synaptics doesn't do any
pointer jump mitigation and these events are just forwarded as-is. Only
possibility here is that the acceleration ramp-up is higher and thus these get
filtered out in the acceleration code somewhere.

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[Wayland-bugs] [Bug 105640] Lenovo T440p - slow fine touchpad movement makes cursor jump

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https://bugs.freedesktop.org/show_bug.cgi?id=105640

--- Comment #11 from Anton  ---
Hello. Same problem on my Lenovo t440. Slowly motions cause cursor jumpy. On
Xorg with synaptics touchpad work perfectly.
I tried patch from first comment , the problem was slightly resolved, but it
remained.

System: Fedora 27
DE: Gnome3
Kernel: 4.15.10-300.fc27.x86_64
Libinput: 1.10.2
Udev info:
P: /devices/platform/i8042/serio1/input/input11/event17
N: input/event17
E: DEVNAME=/dev/input/event17
E: DEVPATH=/devices/platform/i8042/serio1/input/input11/event17
E: EVDEV_ABS_00=::41
E: EVDEV_ABS_01=::37
E: EVDEV_ABS_35=::41
E: EVDEV_ABS_36=::37
E: ID_BUS=i8042
E: ID_INPUT=1
E: ID_INPUT_HEIGHT_MM=75
E: ID_INPUT_TOUCHPAD=1
E: ID_INPUT_TOUCHPAD_INTEGRATION=internal
E: ID_INPUT_WIDTH_MM=99
E: LIBINPUT_DEVICE_GROUP=11/2/7:isa0060/serio1
E: LIBINPUT_MODEL_LENOVO_T450_TOUCHPAD=1
E: LIBINPUT_MODEL_SYNAPTICS_SERIAL_TOUCHPAD=1
E: MAJOR=13
E: MINOR=81
E: SUBSYSTEM=input
E: USEC_INITIALIZED=6418050

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[Wayland-bugs] [Bug 105640] Lenovo T440p - slow fine touchpad movement makes cursor jump

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https://bugs.freedesktop.org/show_bug.cgi?id=105640

--- Comment #10 from L Holland  ---
By the way, FWIW, I get lots of these in my logs:

(EE) event19 - Synaptics tm2964-001: kernel bug: Touch jump detected and
discarded.

Not sure if this is connected - they don't necessarily occur at the same time
as I try to do fine movement.

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[Wayland-bugs] [Bug 105640] Lenovo T440p - slow fine touchpad movement makes cursor jump

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https://bugs.freedesktop.org/show_bug.cgi?id=105640

--- Comment #9 from L Holland  ---
It's certainly possible that the patch helped somewhat; it's just really hard
to distinguish subjectively between the level of "jumpiness" between restarts.
All I can say is that as things stand it is still challenging to do finer work
with the trackpad.

Maybe there's a problem with what I've done, however. You say that one of the
categories of jump in the latest recording ought to be fixed by the patch; but
the recording was made *after* I applied the hwdb changes, so this jump
shouldn't be showing up at all now but as you can see from the udevadm info
output, that variable does appear to be set, so I'm confused. Have I
misunderstood here or is there some other way to check that the updated
behaviour really is being used?

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[Wayland-bugs] [Bug 105640] Lenovo T440p - slow fine touchpad movement makes cursor jump

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https://bugs.freedesktop.org/show_bug.cgi?id=105640

--- Comment #8 from Peter Hutterer  ---
fwiw, I pushed the quirk out for now because I do think it helps, even if it
doesn't remove the issue.

commit 238ffd322728ed386bf59c79f5f7016fe4349944
Author: Peter Hutterer <>
Date:   Mon Mar 19 15:39:22 2018 +1000

 udev: add the T440p to the T450 jumping motion quirks

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[Wayland-bugs] [Bug 105640] Lenovo T440p - slow fine touchpad movement makes cursor jump

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=105640

--- Comment #6 from L Holland  ---
Created attachment 138269
  --> https://bugs.freedesktop.org/attachment.cgi?id=138269=edit
New evemu recording

Yes, I've restarted since updating hwdb, to no avail :-( I'm attaching another
evemu recording now that I'm running with the T450 quirks patch in case it
provides any further enlightenment...

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[Wayland-bugs] [Bug 105640] Lenovo T440p - slow fine touchpad movement makes cursor jump

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=105640

--- Comment #5 from Peter Hutterer  ---
I'm assuming you restarted your session after the hwdb updates so libinput can
pick it up? In that case - there's no ready answer to your cursor jumps, sorry.
One or two more recordings won't hurt, just to get some more ideas on what
affects it here but this needs to be analysed and likely some patch written for
this device only.

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[Wayland-bugs] [Bug 105640] Lenovo T440p - slow fine touchpad movement makes cursor jump

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https://bugs.freedesktop.org/show_bug.cgi?id=105640

--- Comment #4 from L Holland  ---
Ok, so I followed all the instructions there (sorry, that was totally findable,
should have known there would be good docs on how to do that!). Here's the
output of udevadm info for the device:

P: /devices/rmi4-00/input/input16/event14
N: input/event14
E: DEVNAME=/dev/input/event14
E: DEVPATH=/devices/rmi4-00/input/input16/event14
E: ID_BUS=rmi
E: ID_INPUT=1
E: ID_INPUT_HEIGHT_MM=66
E: ID_INPUT_TOUCHPAD=1
E: ID_INPUT_TOUCHPAD_INTEGRATION=internal
E: ID_INPUT_WIDTH_MM=97
E: ID_SERIAL=noserial
E: LIBINPUT_DEVICE_GROUP=1d/6cb/0:rmi4-00
E: LIBINPUT_MODEL_LENOVO_T450_TOUCHPAD=1
E: MAJOR=13
E: MINOR=78
E: SUBSYSTEM=input
E: USEC_INITIALIZED=2582729


So it looks like that property has been picked up successfully, but sadly I'm
still getting the jumps. Is there anything else I can send/record to give you
more insight?

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[Wayland-bugs] [Bug 105640] Lenovo T440p - slow fine touchpad movement makes cursor jump

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https://bugs.freedesktop.org/show_bug.cgi?id=105640

--- Comment #3 from Peter Hutterer  ---
https://wayland.freedesktop.org/libinput/doc/latest/udev_config.html#hwdb has
the list of things you need to be careful of, particularly running udevadm hwdb
--update and checking the property is set for the device.

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[Wayland-bugs] [Bug 105640] Lenovo T440p - slow fine touchpad movement makes cursor jump

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https://bugs.freedesktop.org/show_bug.cgi?id=105640

--- Comment #2 from L Holland  ---
Ok, just want to check that what I did was correct here. Rather than rebuilding
and reinstalling (I'm currently running libinput 1.10.3 from the Arch Repo) I
just manually applied the patch to
/usr/lib/udev/hwdb.d/90-libinput-model-quirks.hwdb, and then rebooted to be
sure. Let me know if that's wrong.

Anyway, I don't notice any significant improvement. It's possible that the
jumps have been very slightly reduced but it's hard to be sure, and the cursor
definitely still jumps on fine movement - attempting to do precisely selection
in GIMP etc is still a challenge.

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[Wayland-bugs] [Bug 105640] Lenovo T440p - slow fine touchpad movement makes cursor jump

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https://bugs.freedesktop.org/show_bug.cgi?id=105640

Peter Hutterer  changed:

   What|Removed |Added

 CC||peter.hutte...@who-t.net

--- Comment #1 from Peter Hutterer  ---
Created attachment 138235
  --> https://bugs.freedesktop.org/attachment.cgi?id=138235=edit
0001-udev-add-the-T440p-to-the-T450-jumping-motion-quirks.patch

Please give this one a test, thanks

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[Wayland-bugs] [Bug 105640] Lenovo T440p - slow fine touchpad movement makes cursor jump

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=105640

Bug ID: 105640
   Summary: Lenovo T440p - slow fine touchpad movement makes
cursor jump
   Product: Wayland
   Version: unspecified
  Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
  Severity: normal
  Priority: medium
 Component: libinput
  Assignee: wayland-bugs@lists.freedesktop.org
  Reporter: lucian+freedesk...@symposion.co.uk

Created attachment 138234
  --> https://bugs.freedesktop.org/attachment.cgi?id=138234=edit
Evemu recording of fine movement with jumps

As discussed here: https://bugs.freedesktop.org/show_bug.cgi?id=105022 slow
fine cursor movement on my trackpad causes frustrating cursor jumps.

udev info:
P: /devices/rmi4-00/input/input21/event19
N: input/event19
E: DEVNAME=/dev/input/event19
E: DEVPATH=/devices/rmi4-00/input/input21/event19
E: ID_BUS=rmi
E: ID_INPUT=1
E: ID_INPUT_HEIGHT_MM=66
E: ID_INPUT_TOUCHPAD=1
E: ID_INPUT_TOUCHPAD_INTEGRATION=internal
E: ID_INPUT_WIDTH_MM=97
E: ID_SERIAL=noserial
E: LIBINPUT_DEVICE_GROUP=1d/6cb/0:rmi4-00
E: MAJOR=13
E: MINOR=83
E: SUBSYSTEM=input
E: USEC_INITIALIZED=2578784

modalias:
dmi:bvnLENOVO:bvrGLET80WW(2.34):bd07/23/2015:svnLENOVO:pn20AN006NUS:pvrThinkPadT440p:rvnLENOVO:rn20AN006NUS:rvr0B98401WIN:cvnLENOVO:ct10:cvrNotAvailable:

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