As per
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1694225/comments/31
.
** Changed in: linux (Ubuntu)
Status: Incomplete => Fix Released
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https://bugs.launchpad.net/bugs/1694225
Title:
[Thinkpad T450s] Click lock effect on trackpoint left button when
touchpad is disabled
Status in linux package in Ubuntu:
Fix Released
Bug description:
The disabled touchpad of my Thinkpad T450s sometimes triggers a click
lock when I touch it with my palm. This is typical when I'm reaching
to click the trackpoint's (red pointing stick) left button.
Reproduction steps:
1. Disable the touchpad via Ubuntu's "Mouse & Touchpad" setting.
2. Place and hold two fingers in contact with the touchpad.
3. Click then release the trackpoint's left button once while the
cursor is on the desktop area. Then immediately move the cursor with
the pointing stick.
4. If the click lock effect gets triggered, a selection would have
been made and dragged on the desktop area. If the click lock doesn't
happen, repeat step 3.
The evtest log on the trackpoint:
$evtest /dev/input/event15
Input driver version is 1.0.1
Input device ID: bus 0x11 vendor 0x2 product 0xa version 0x0
Input device name: "TPPS/2 IBM TrackPoint"
Supported events:
Event type 0 (EV_SYN)
Event type 1 (EV_KEY)
Event code 272 (BTN_LEFT)
Event code 273 (BTN_RIGHT)
Event code 274 (BTN_MIDDLE)
Event type 2 (EV_REL)
Event code 0 (REL_X)
Event code 1 (REL_Y)
Properties:
Property type 0 (INPUT_PROP_POINTER)
Property type 5 (INPUT_PROP_POINTING_STICK)
Testing ... (interrupt to exit)
Event: time 1496047216.720823, type 1 (EV_KEY), code 272 (BTN_LEFT), value 1
Event: time 1496047216.720823, -------------- SYN_REPORT ------------
Event: time 1496047216.778898, type 1 (EV_KEY), code 272 (BTN_LEFT), value 0
Event: time 1496047216.778898, -------------- SYN_REPORT ------------
Event: time 1496047220.234518, type 1 (EV_KEY), code 272 (BTN_LEFT), value 1
Event: time 1496047220.234518, -------------- SYN_REPORT ------------
If the click lock is not triggered, you would see BTN_LEFT's value 1 & 0:
Event: time 1496047216.720823, type 1 (EV_KEY), code 272 (BTN_LEFT), value 1
Event: time 1496047216.778898, type 1 (EV_KEY), code 272 (BTN_LEFT), value 0
But if the click lock is triggered, you would only see value 1:
Event: time 1496047220.234518, type 1 (EV_KEY), code 272 (BTN_LEFT), value 1
I am guessing "value 0" means release the button. So when click lock
is happening, the button left is not released at all, thus it's
producing "hold the button" effect.
This issue doesn't happen with Windows. I can confirm it happens on
Ubuntu v17/v16, Kubuntu, Ubuntu Mate, Xubuntu, Lubuntu, Linux Mint,
Fedora, and Open Suse.
Also, the issue doesn't occur on older thinkpad models which doesn't
use the same clickpad, e.g. T430 or X230.
WORKAROUND: Execute at a terminal:
sudo rmmod psmouse && sudo modprobe psmouse proto=imps
---
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: ubuntu 3980 F.... pulseaudio
/dev/snd/controlC0: ubuntu 3980 F.... pulseaudio
CasperVersion: 1.387
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 17.10
LiveMediaBuild: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
MachineType: LENOVO 20BX001LUS
Package: linux (not installed)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: file=/cdrom/preseed/username.seed boot=casper
initrd=/casper/initrd.lz quiet splash --- maybe-ubiquity
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
RelatedPackageVersions:
linux-restricted-modules-4.13.0-16-generic N/A
linux-backports-modules-4.13.0-16-generic N/A
linux-firmware 1.169
Tags: artful
Uname: Linux 4.13.0-16-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 03/16/2017
dmi.bios.vendor: LENOVO
dmi.bios.version: JBET64WW (1.28 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20BX001LUS
dmi.board.vendor: LENOVO
dmi.board.version: SDK0E50510 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias:
dmi:bvnLENOVO:bvrJBET64WW(1.28):bd03/16/2017:svnLENOVO:pn20BX001LUS:pvrThinkPadT450s:rvnLENOVO:rn20BX001LUS:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad T450s
dmi.product.name: 20BX001LUS
dmi.product.version: ThinkPad T450s
dmi.sys.vendor: LENOVO
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