Better solution to disabling touchpad on external mouse connection??

Hi all,
I've been playing around with a "clean" solution to disabling the Synaptics touchpad on my laptop - when I connected a USB external mouse OR when the USB mouse is already connected at boot...
I have a very hacked together solution... First for info the stock "mouse" devices on laptop...
lrwxrwxrwx 1 root root 0 26.09.2013 12:38 mouse0 -> ../../devices/virtual/input/input6/mouse0/
lrwxrwxrwx 1 root root 0 26.09.2013 12:38 mouse1 -> ../../devices/platform/i8042/serio4/input/input14/mouse1/
FYI MCE IR Keyboard/Mouse (ite-cir) and Synaptics touchpad respectively.
So I have a simple script...
#! /bin/bash
username=$(users | gawk '{print $1}')
export DISPLAY=":0"
export XAUTHORITY="/home/${username}/.Xauthority"
if $(lsusb -v | grep -q Mouse); then
synclient TouchpadOff=1
else
synclient TouchpadOff=0
fi
exit 0
that is called by a udev (/etc/udev/rules.d/01-touchpad.rules ) rule...
ACTION=="add", SUBSYSTEM=="input", KERNEL=="mouse[0-9]", ENV{ID_CLASS}="mouse", PROGRAM="/root/Scripts/mouse_detect.sh"
ACTION=="remove", SUBSYSTEM=="input", KERNEL=="mouse[0-9]", ENV{ID_CLASS}="mouse", PROGRAM="/root/Scripts/mouse_detect.sh"
Problem is that solution does not fire when I logout and login again, or boot from cold, into KDM/KDE... My hack to solve this problem was the following (awful!!) systemd unit...
[Unit]
Description=Mouse Detect (on Desktop Environment startup)
After=display-manager.service
Requires=display-manager.service
[Service]
Type=oneshot
RestartSec=20
Restart=always
ExecStart=/root/Scripts/mouse_detect.sh
[Install]
WantedBy=graphical.target
It's stored as mouse-detect.service in /etc/systemd/system ... It fires too early, probably when KDM is active (hence why it auto-restarts every 20 seconds).... Not even sure if it's possible to get the mouse_detect.sh script to work during the KDM Session (as I'm not sure where the Xauthority information is stored for KDM and so on)...
If I make it the service unit stop on a successful run of synclient (e.g. Restart=onfailure) - it won't every refire - if say I logout and log back into my KDE session!!
Any thoughts on how to do this more cleanly??
Given that the current solution works - I was just looking to learn some more - by implementing a less hacked version!!
Thanks
Bob
Last edited by bobwya (2013-09-26 14:25:52)

Zamajalo wrote:What about using one simple udev rule? Manual can be found here
The udev rule falls down when you boot with a USB mouse already attached to the laptop - on boot (as I clearly stated). The rule only detects change of state (mouse attached or detached). Also what if you have 2 USB mice attached?? :-) The udev idea of what a "mouse" is - is also rather generic (e.g. touchpad, infrared remote control are definitely not USB mice!!)
The script is overkill for running from a udev rule (- although it does have the benefit of not have a hard-coded username). However the script is necessary to test for a mouse being attached - when a KDE session starts. That was basically what my question was about... How to run this script at the start of the KDE session - my use of lsusb is annoying - because it means the script must run as root (due to the verbose flag)... There must be a way to do this as a normal desktop user (and then the script should run OK in a normal autostart desktop script).
Thanks
Bob

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Better solution to disabling touchpad on external mouse connection??

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