Fred:
> On 4/22/22 15:31, karl@??? wrote:
...
> > gpm -b 1200 -m /dev/ttyS1 -t msc
...
> It shows up at /dev/ttyUSB0. I have tried that command line several
> times. Nothing happens. ps -e shows gpm is running. The pointer will
> not move and the mouse buttons have no effect.
...

You have to be aware that gpm is for virtual consoles:

$ man gpm | grep 'gpm - '
       gpm - a cut and paste utility and mouse server for virtual consoles

So in X11, openbox etc. graphical environment, it has no effect unless
you take special action. With graphical environment I mean bitmapped as
opposed to character (i.e. letters) based graphics.

Testing with gpm is best done without X11, so stop your window manager
(obenbox) and exit from X11. If you then is presented with a greeter
(also called display manager, see
https://en.wikipedia.org/wiki/X_display_manager_(program_type)
), see if you can stop the greeter.

Also testing has to be done as root.

So, make sure you are running in a virtual console and logged in as
root, then run the gpm -b etc. thing and move the mouse around.

To make the mouse to work in X11, please test the mouse with gpm in
a console first to assert basic functionality, and then come back.

Regards,
/Karl Hammar