This is not a 'How to Configure Scroll/Buttons' type question.

I have a Logitech Marble Mouse (a two-button trackball), model number T-CM14.

Problem: The mouse pointer on screen is very laggy, to the point of not being usable: approximately ten full rotations of the trackball to get the pointer from the top of the screen to the bottom, for example.

System specification:

  • OS: Ubuntu Studio 18.04 (Xfce) x64
  • Newly installed, Partner Repositories enabled and Restricted-Extras added
  • PC: Dell Insperon with USB-only connections

The trackball is attached using a USB-to-PS/2 adapter:

$ lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 004: ID 04d9:1400 Holtek Semiconductor, Inc. PS/2 keyboard + mouse controller
Bus 002 Device 006: ID 046d:c077 Logitech, Inc. M105 Optical Mouse
Bus 002 Device 002: ID 413c:2107 Dell Computer Corp. 
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

(I should point out that the 'M105 Optical Mouse' is a second pointing device I have plugged in to get a working pointer on-screen, having it plugged in, or not, doesn't seem to affect the problem with the trackball's lack of performance.)

Funny thing was one time I had rebooted with just the trackball/adapter installed, this time in the front USB port, and it started working like normal. But this condition did not last and I am back to adding the standard mouse to get that pointer where it needs to be, on-screen.

How to fix my mouse pointer to respond to the trackball's rotation like it's supposed to?

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