Regardless, this bug is closed. If you have any new problems with
xserver-xorg-input-synaptics installed then please open a new bug by
running:
ubuntu-bug xserver-xorg-input-synaptics
Otherwise please run:
ubuntu-bug libinput
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Actually my issue is much closer to bug 1791427 (comment #62).
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Title:
Touchpads are unresponsive and laggy for small finger movements
I see a much worse version of this problem on my brand new ThinkPad X1
Carbon 6th gen: the mouse cursor moves/clicks only about 5% of the time
I use the touchpad. The Trackpoint doesn't work at all. Installing
Ubuntu was a keyboard-only affair, and I hoped that some updates would
fix this
** Changed in: libinput
Status: Confirmed => Fix Released
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Title:
Touchpads are unresponsive and laggy for small finger
Yes, upstream reopened this bug because it regressed. I'm not sure how
we want to handle that in Launchpad.
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Title:
Touchpads are
** Changed in: libinput
Status: Fix Released => Confirmed
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Title:
Touchpads are unresponsive and laggy for small finger
This bug was fixed in the package libinput - 1.9.4-2ubuntu1
---
libinput (1.9.4-2ubuntu1) bionic; urgency=medium
* Restore and refresh fix-lp1696929.patch to fix unresponsive/laggy touchpad
behaviour caused by inappropriate use of software hysteresis (LP: #1696929)
This
** Changed in: libinput (Ubuntu Bionic)
Status: In Progress => Fix Committed
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Title:
Touchpads are unresponsive and laggy for
uploaded, stuck in the queue like everything else
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Title:
Touchpads are unresponsive and laggy for small finger movements
To manage
A fresh fix for bionic, that should satisfy everyone now.
** Patch added: "libinput_1.9.4-2ubuntu1.debdiff"
https://bugs.launchpad.net/ubuntu/+source/libinput/+bug/1696929/+attachment/5040905/+files/libinput_1.9.4-2ubuntu1.debdiff
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** Description changed:
Some laptop touchpads are annoyingly unresponsive when the software
implements any kind of hysteresis. This is a regression caused by the
introduction of libinput, visible on at least Lenovo X1 Carbon gen 4 and
5, Dell XPS 13, and Apple Macbook Air.
WORKAROUND
Actually we don't need to ignore it. We can release the fixes for the
regression. The fixes are:
1. libinput:
https://lists.freedesktop.org/archives/wayland-devel/2018-January/036475.html
(not landed yet)
2. kernel: https://bugs.freedesktop.org/show_bug.cgi?id=104533 (not tested yet)
James
I don't understand how we can ignore a well known regression? If there's
a kernel patch as a result then surely we'll want it in bionic?
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Actually we may be blocked waiting to see if the first fix for James'
issue lands:
https://lists.freedesktop.org/archives/wayland-
devel/2018-January/036475.html
We should include that if it does.
The second fix for James' issue we can ignore providing it stays a
kernel problem:
** Summary changed:
- Touchpads are unresponsive and laggy
+ Touchpads are unresponsive and laggy for small finger movements
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Title:
** Description changed:
Some laptop touchpads are annoyingly unresponsive when the software
- implements any kind of hysteresis. This includes Lenovo X1 Carbon gen 4
- and 5. Such devices have lower precision and higher lag in the touchpad
- hardware than you might expect, so need the software
Timo,
Any chance we could patch this for bionic only? No need to wait for
libinput release 1.10. Just take the fixes that are in the master branch
already and backport.
That would avoid clashing with James using Debian. Actually in general I
think many more people will need the fix than the
Generalised the bug title again. I now realise other common machines
like the Dell XPS 13 and Macbook Air 13 experience this same bug. In all
cases I have to revert to a Xorg session and installing xserver-xorg-
input-synaptics to be able to use the touchpad adequately.
** Summary changed:
- X1
intel hasn't been the default driver since 16.10, modesetting is (on
gen4 and up)
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Title:
Touchpads are unresponsive and laggy
To
Workaround:
1. sudo apt install xserver-xorg-input-synaptics
2. Log out
3. On the login screen select session "Ubuntu on Xorg"
4. After logging in, disable hysteresis:
synclient HorizHysteresis=0 VertHysteresis=0
This won't cure laggy hardware but it will at least eliminate the
software lag
Don't forget to also 'chmod 644 /etc/X11/xorg.conf' or else logging in
may fail.
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Title:
Touchpads are unresponsive and laggy
To
** Summary changed:
- X1 Carbon gen4 and gen5 touchpads are unresponsive and laggy
+ Touchpads are unresponsive and laggy
** Changed in: libinput (Ubuntu)
Status: Incomplete => Confirmed
** No longer affects: gnome-shell (Ubuntu)
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