A man who fatally stabbed his father with a hunting knife after an argument over a computer has been sentenced to at least three years' jail in a Sydney court.

Daniel Chapman, 22, stabbed his father Stephen Chapman, 56, in the back with a 14-centimetre blade in October 2016 after an argument erupted because he refused to stop playing a computer game and come to dinner.

Daniel Chapman is led into the courts on Friday afternoon. Credit:AAP

His parents became increasingly frustrated, with his mother asking his father to disconnect the internet.

Stephen had turned off the internet modem and was trying to unplug cables from his son's computer when he was stabbed in back of his right shoulder and collapsed to the ground.