For Those who are Having touch unresponsive after upgrading to CM12

• Update your Firmware manually via Recovery download firmware from Here
• For those who don't know how to go in to recovery 
• first power off your phone than press power button along with volume down button to go to recovery. In Recovery flash downloaded zip file. 
• Than check most probably your problem will be sorted out.
• For those who love to have latest software should go for My compiled CM-12.1 source built ROM  from Here 
• 1st flash firmware than flash ROM  than flash Gapps Slim or Banks
• flash Super SU  for Rooting your Phone. get it from here
• Use holo launcher Hd I prefer it over  default CM or Google now Launcher. For it's far batter response and customization option.
• Note Those who don't love to to take this much pain can just try getting holo launcher hd from Market. 
• Please do Report the weather and what has helped you or not.