[ubuntu-studio-users] Spurious effects

[Ralf Mardorf]

Run

  sudo apt-get update && sudo apt-get dist-upgrade && sudo apt-get install x11-utils xinput

to install the needed command.

If you then run

  xev

you get information about hardware that might move the mouse pointer.

Perhaps the hardware is broken. I guess that assumed the software should be
fishy, it won't display something, when the mouse pointer moves, but this
not necessarily is ensured, so better disable the mouse pad and connect an
external mouse for testing purpose.

Run
  
  xinput --list

and then

  xinput disable NUMBER_OF_THE_TOUCHPAD

An example, since I don't have a touchpad, I show how to disablen and
enable my optical mouse.

  xinput --list
  ⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
  ⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
  ⎜   ↳ USB Optical Mouse                       	id=8	[slave  pointer  (2)]
  ⎣ Virtual core keyboard                   	id=3	[master keyboard (2)]
      ↳ Virtual core XTEST keyboard             	id=5	[slave  keyboard (3)]
      ↳ Power Button                            	id=6	[slave  keyboard (3)]
      ↳ Power Button                            	id=7	[slave  keyboard (3)]
      ↳ AT Translated Set 2 keyboard            	id=9	[slave  keyboard (3)]

To disable the mouse I need to run

  xinput disable 8

and to enable it

  xinput enable 8

Regards,
Ralf