Having found a way to reliably reproduce the issue I vaguely understand
what is happening.
The kernel psmouse driver probes the TouchPad, reognizes it as a
Synaptic touchpad, and performs Synaptic-specific initialization. This
happens regardless of whether the TouchPad is switched off in the BIOS
or not (!). Then udev recognizes the device and data from the TouchPad
will start appearing on /dev/input/event* (in my case, event5). Then X
gets started and the xinput infrastructure loads its own input drivers
on top of that.
At that point the TouchPad starts to interfere with the physical
buttons. When you touch the TouchPad in a particular manner (e.g. with
your thumb) before you press a button, then release the button, X does
not register a button release event (as per "evtest"), and the button
appears stuck. This happens even if the TouchPad is disabled via xinput
or using "synclient TouchpadOff=1". It does appear that something
somewhere gets confused by the TouchPad button press, even if the
TouchPad is supposed to be disabled. (I have tried a variety of
synclient/xinput properties, none of them make any difference.)
The issue can be worked around by preventing creation of the device
nodes for the TouchPad. Since the BIOS setting to disable the TouchPad
does not work reliably (or at all?), that means working around the
Synaptics probe in the psmouse kernel module.
So below is another workound, which builds on the workaround in #49.
Basically it unloads the kernel psmouse driver, then reloads it with the
"bare" mouse protocol. This way the TouchPad is not recognized as a
TouchPad any longer, but it also means the TrackPoint is also no longer
recognized as a TrackPoint, so the xorg config files need to specify
"PS/2 Generic Mouse".
1. Step 4 of #49 needs to be replaced by:
Section "InputClass"
Identifier "TrackPoint"
MatchProduct "PS/2 Generic Mouse"
MatchDevicePath "/dev/input/event*"
Option "EmulateWheel" "1"
Option "EmulateWheelButton" "2"
Option "Emulate3Buttons" "0"
Option "XAxisMapping" "6 7"
Option "YAxisMapping" "4 5"
Driver "evdev"
EndSection
2. In /etc/rc.local add:
modprobe -r psmouse
modprobe psmouse proto=bare
With this workaround I can no longer reproduce the problem, also after
sleep/hibernate cycles. Still it remains a nasty workaround: the
TouchPad is dead and system upgrades can easily probably break this
workaround at some point, so I hope that the additional information is
useful in solving the underlying problem.
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https://bugs.launchpad.net/bugs/1506817
Title:
left TPP/2 IBM TrackPoint "sticks on" randomly (X250 15.04)
Status in linux package in Ubuntu:
Confirmed
Bug description:
I have reported the details of this problem at
https://answers.launchpad.net/ubuntu-certification/+question/272142
As summarized on that question:
X250 analysis:
I used the command on the X250
evtest /dev/input/event15 | grep EV_KEY
I can see the bug, as follows:
I click on button 1 (left) over and over. When I push the button down,
I see it register as 1,
and when I let go of the key, it registers as a 0.
The bug is that every now and then (once every 20 clicks), when I let go
of the left mouse button (BIN_LEFT), it does not return to state 0 (it stays
in state 1).
This is highly random, but cant be triggered more often, by dragging a
window, which I do with BIN_LEFT.
I am using a brand new X250, purchased in late July 2015. The system was
returned 3 times to IBM repair as I assumed
this was a hardware error. Now with the above, it seems clear that this is a
software issue.
Ubuntu 15.04
apt-cache policy xserver-xorg-input-synaptics
xserver-xorg-input-synaptics:
Installed: 1.8.1-1ubuntu1
Candidate: 1.8.1-1ubuntu1
Version table:
*** 1.8.1-1ubuntu1 0
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: xserver-xorg-input-synaptics 1.8.1-1ubuntu1
ProcVersionSignature: Ubuntu 3.19.0-30.34-generic 3.19.8-ckt6
Uname: Linux 3.19.0-30-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.5
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Oct 16 04:52:03 2015
DistUpgraded: Fresh install
DistroCodename: vivid
DistroVariant: ubuntu
InstallationDate: Installed on 2015-08-15 (61 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
MachineType: LENOVO 20CMCTO1WW
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-30-generic.efi.signed
root=UUID=5718b40f-944e-47a3-acda-04e29336d0bc ro quiet splash vt.handoff=7
SourcePackage: xserver-xorg-input-synaptics
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/19/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: N10ET36W (1.15 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20CMCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: 0B98417 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias:
dmi:bvnLENOVO:bvrN10ET36W(1.15):bd06/19/2015:svnLENOVO:pn20CMCTO1WW:pvrThinkPadX250:rvnLENOVO:rn20CMCTO1WW:rvr0B98417WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.name: 20CMCTO1WW
dmi.product.version: ThinkPad X250
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.12.1+15.04.20150410.1-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.60-2
version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.9-2ubuntu1~vivid2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.9-2ubuntu1~vivid2
version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917-1~exp1ubuntu2.2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau
1:1.0.11-1ubuntu2build1
xserver.bootTime: Fri Oct 16 03:31:10 2015
xserver.configfile: default
xserver.errors:
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
product id 1079
vendor LGD
xserver.version: 2:1.17.1-0ubuntu3.1
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