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The gpm is mouse server in Linux.
What it does? It will read mouse events, moves and clicks, and give that information to applications. It has many drivers included, so it will work with almost any mouse on the market.
Note before you start, gpm needs parameters.
The most important is
that will stop mouse server. Don't laugh, before you start car, you should know where is the brake.
If you missed some parameter and you can't see mouse cursor on the screen, than this is the simplest way to stop it.