Special Forums Hardware How to *completely* disable laptop touchpad, without disabling trackpoint? Post 303041241 by DevuanFan on Tuesday 19th of November 2019 08:30:47 AM
How to *completely* disable laptop touchpad, without disabling trackpoint?

I run Devuan ASCII on my T400 laptop. I only use the trackpoint ("nipple mouse"). To me, the touchpad is just a nuisance.

I've discovered (by monitoring output of sudo cat /dev/input/event5) that the touchpad generates random input while the lid is closed. This causes applications that should run while the system is idle (e.g., xscreensaver) to never run while the lid is closed.

I've tried to disable the touchpad via xinput, synaptics and evtest (evtest --grab /dev/input/event5 >/dev/null 2>&1), but none of these remedy the issue. The only remedy I've found is to unbind the touchpad's driver with this command:
Code:
# echo serio1 >/sys/bus/serio/drivers/psmouse/unbind

Unfortunately, the above command has the unacceptable side effect of simultaneously unbinding serio2, which renders my trackpoint ("nipple mouse") inoperable.

Please, do you know how to *completely* disable the touchpad (e.g., via unbinding its driver) without disabling the trackpoint?

P.S. Here is some relevant information:
Code:
bruno@thinkpad:~$ cat /proc/bus/input/devices
---snip---
I: Bus=0011 Vendor=0002 Product=0007 Version=01b1
N: Name="SynPS/2 Synaptics TouchPad"
P: Phys=isa0060/serio1/input0
S: Sysfs=/devices/platform/i8042/serio1/input/input6
U: Uniq=
H: Handlers=mouse0 event5
B: PROP=1
B: EV=b
B: KEY=420 30000 0 0 0 0
B: ABS=11000003

I: Bus=0011 Vendor=0002 Product=000a Version=0000
N: Name="TPPS/2 IBM TrackPoint"
P: Phys=synaptics-pt/serio0/input0
S: Sysfs=/devices/platform/i8042/serio1/serio2/input/input7
U: Uniq=
H: Handlers=mouse1 event6
B: PROP=21
B: EV=7
B: KEY=70000 0 0 0 0
B: REL=3

This User Gave Thanks to DevuanFan For This Post:
 
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EVTEST(1)																 EVTEST(1)

NAME
evtest - Input device event monitor and query tool SYNOPSIS
evtest /dev/input/eventX evtest --query /dev/input/eventX <type> <value> DESCRIPTION
The first invocation type displayed above ("capture mode") causes evtest to display information about the specified input device, including all the events supported by the device. It then monitors the device and displays all the events layer events generated. In the second invocation type ("query mode"), evtest performs a one-shot query of the state of a specific key value of an event type. type is one of: EV_KEY, EV_SW, EV_SND, EV_LED (or the numerical value) value can be either a decimal representation (e.g. 44), hex (e.g. 0x2c), or the constant name (e.g. KEY_Z) of the key/switch/sound/LED being queried. If the state bit is set (key pressed, switch on, ...), evtest exits with code 10. If the state bit is unset (key depressed, switch off, ...), evtest exits with code 0. No other output is generated. evtest needs to be able to read from the device; in most cases this means it must be run as root. evtest is commonly used to debug issues with input devices in X.Org. The output of evtest shows the information presented by the kernel; based on this information it can be determined whether a bug may be a kernel or an X.Org issue. DIAGNOSTICS
If evtest does not show any events even though the device is being used, the device may be grabbed by a process (EVIOCGRAB). This is usually the case when debugging a synaptics device from within X. VT switching to a TTY or shutting down the X server terminates this grab and synaptics devices can be debugged. EXIT CODE
evtest returns 1 on error. When used to query state, evtest returns 0 if the state bit is unset and 10 if the state bit is set. SEE ALSO
inputattach(1) AUTHOR
evtest was written by Vojtech Pavlik <vojtech@suse.cz[1]>. This manual page was written by Stephen Kitt <steve@sk2.org[2]>, based on that present in the lineakd package, for the Debian GNU/Linux system (but may be used by others). NOTES
1. vojtech@suse.cz mailto:vojtech@suse.cz 2. steve@sk2.org mailto:steve@sk2.org 05/21/2012 EVTEST(1)

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