tilt orientation problems

i can't tilt my device ie after getting a replacement of my phone i cant play games like subway surfers,temple run where we have to tilt our character...Mobile-karbonn a15
I can't ask for a mobile replacement too.In some games my screen automatically changes to landscape view so There is no problem for hardware.Can i get the list of files related to sensors.My phone is rootedOr do i req to flash a new rom or upgrade android firmware??PLs help me.