Manually setting Xorg options from command-line?

Question

Quick question: how do you set xorg options with a command?

For example, I have an Xorg entry as follows:

Section "InputClass"
    Identifier  "Marble Mouse"
    MatchProduct "Logitech USB Trackball"
    ...
    Option "VertScrollDelta" "4"
EndSection

and I'd like to change the value of "VertScrollDelta" without restarting my computer. Do you know any command-line interface to it? I've looked into xinput, but the properties of which does not necessary correspond to xorg options.

Answer 1

xinput is your best bet. I cannot confirm this as working as I do not have similar hardware, but try running:

xinput --set-prop --type=int --format=8 "Logitech USB Trackball" "VertScrollDelta" 4

The --format=8 specifies an 8-bit integer value; using 16 or 32 may work if 8 does not.

You can also use the following to try and troubleshoot this on your own:

xinput --list will show you a list of input devices that xinput can work with

xinput --list-props "Logitech USB Trackball" will show you the current properties for your device

Answer 2

try to install and use gsynaptics to reconfigure your device:

  $ sudo apt-get install gsynaptics