[Thinkpad T450s] Click lock effect on trackpoint left button when touchpad is disabled
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Fix Released
|
Low
|
Unassigned |
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_
Property type 5 (INPUT_
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/
/dev/snd/
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-
PATH=(custom, no user)
XDG_RUNTIME_
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: file=/cdrom/
ProcVersionSign
RelatedPackageV
linux-
linux-
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.
dmi.board.name: 20BX001LUS
dmi.board.vendor: LENOVO
dmi.board.version: SDK0E50510 WIN
dmi.chassis.
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.
dmi.modalias: dmi:bvnLENOVO:
dmi.product.family: ThinkPad T450s
dmi.product.name: 20BX001LUS
dmi.product.
dmi.sys.vendor: LENOVO
Found out it's kernel issue: /bugzilla. redhat. com/show_ bug.cgi? id=1313939# c86
https:/
Kernel v4.12 would fix the issue. I hope ubuntu will get the kernel fix too.