DS4 Touchpad emulating mouse screws up bindings over steam link

[JohnBDev]

I have RetroPie installed and Steam Link too. I have a DualShock 4 (PS4) controller that the touchpad on it emulates a mouse when Steam Link is launched, and it screws up bindings in games. I found posts on this forum and Reddit, but none of them worked. How do I prevent it from emulating a mouse with the DS4 touchpad?

[mitu]

You can add an udev rule to remove the Touchpad device from being created. Something like:

 SUBSYSTEM=="input", ATTRS{name}=="*Touchpad", RUN+="/bin/rm %E{DEVNAME}", ENV{ID_INPUT_JOYSTICK}=""

[JohnBDev]

@mitu sorry for being stupid, but where do I put this?

EDIT: Nevermind, it goes in /etc/udev/rules.d/ a Google search can go a long way.

[mitu]

You need to create a udev configuration file under /etc/udev/rules.d.
Run from the command line (or a SSH) session:

echo 'SUBSYSTEM=="input", ATTRS{name}=="*Touchpad", RUN+="/bin/rm %E{DEVNAME}", ENV{ID_INPUT_JOYSTICK}=""' | sudo tee /etc/udev/rules.d/99-disable-touchpad.rules

then reboot. See if the touchpad still functions after this.

To get back the touchpad, you can remove the file with

sudo rm /etc/udev/rules.d/99-disable-touchpad.rules

followed by a reboot.