Mouse not working when ubuntu boots

[Hazan Pérez]

Hey everyone,

In my desktop PC I'm having a weird problem. Whenever I boot into Ubuntu 
and login the mouse doesn't work. It won't "turn on" by default and even 
the clicks don't get registered. When I log in it keeps like this until 
I open Firefox, then the mouse works like it should.

Also, if I log out and log in after the mouse works it keeps working 
normally.

This is a problem that only occurred recently.

This is a desktop with Ubuntu 12.04, AMD phenom processor, AMD HD Radeon 
graphics card with the privative video drivers. The mouse is a regular 
Hyundai Corporation USB mouse.

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Hazan Pérez C.
Twisto Creative