Public bug reported:
I've found that if I quickly alternate tapping with two fingers on the
touchpad the cursor jumps wildly.
This is quite frustrating for me as I often move the cursor with one
finger on my right hand while subsequently clicking the bottom left of
the touchpad with the left to cause a 'left click' action. Often this
causes my mouse to jump to the bottom left of the screen and open the
cinnamon menu window.
It seems if I monitor events with xinput that the a[0] and a[1] events
are being swapped.
motion a[0]=4734
motion a[0]=4734
motion a[0]=4733
motion a[1]=1984
motion a[1]=1983
motion a[1]=1982
motion a[1]=1980
motion a[1]=1983
motion a[1]=1987
motion a[1]=1991
motion a[1]=1996
motion a[1]=2001
motion a[0]=2760 a[1]=4719 <-- Jump happens here
...
Example 2:
motion a[0]=4578
motion a[0]=4578
motion a[0]=4577
motion a[0]=4577
motion a[0]=4576
motion a[0]=4575
motion a[0]=4575
motion a[1]=1990
motion a[1]=1989
motion a[1]=1987
motion a[1]=1986
motion a[1]=1984
motion a[1]=1983
motion a[0]=4577 a[1]=1977
motion a[0]=1472 a[1]=4719 <-- Jump happens here
motion a[0]=1472 a[1]=4722
I would have thought that the synaptics driver code would have
identified 'erratic' input events which appear to be too far apart to be
naturally occurring and simply filter them out?
I could not repeat this when I loaded an Ubuntu 13.10 Live USB disk but
the Synaptics TouchPad driver did not appear to be loaded at that time
as it didn't appear in xinput list.
~> lsb_release -rd
Description: Linux Mint 16 Petra
Release: 16
~>uname -a
Linux chris-XPS13 3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 2013
x86_64 x86_64 x86_64 GNU/Linux
~> dpkg -l | grep input-synaptics
ii xserver-xorg-input-synaptics 1.7.1-0ubuntu1
amd64 Synaptics TouchPad driver for X.Org server
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: xserver-xorg-input-synaptics 1.7.1-0ubuntu1 [modified:
usr/share/X11/xorg.conf.d/50-synaptics.conf]
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: amd64
Date: Mon Feb 24 21:00:55 2014
InstallationDate: Installed on 2014-02-13 (11 days ago)
InstallationMedia: Linux Mint 16 "petra" - Release amd64 20131126
MarkForUpload: True
ProcEnviron:
TERM=screen
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_GB.UTF-8
SHELL=/usr/bin/fish
SourcePackage: xserver-xorg-input-synaptics
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: xserver-xorg-input-synaptics (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug petra third-party-packages
--
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-input-synaptics in Ubuntu.
https://bugs.launchpad.net/bugs/1284318
Title:
alternate finger tapping causes cursor to jump
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-synaptics/+bug/1284318/+subscriptions
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