Sony and Immersion end suit.

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Sony's video game unit and Immersion have ended their patent fight and signed a deal that opens the door to putting the latter's Rumble technology into the former's PlayStation 3, the companies said Thursday.

Rumble technology makes a video game controller vibrate so that action on the screen seems more real--for example, when a race car is off the track--and has been a key feature in controllers for Sony's market-dominating PlayStation 2 console.