I having the same issue I had with most GB roms now with ICS roms. When I am running stock GB/ICS my functions correctly and either lights up when I take the phone away from my face or sometimes I need to hit the power button for it to display again. With most roms the phone does not respond to anything after the call is initiated. For example, if someone doesn't answer and I need to end the phone call I have to pull the battery to get the phone to disconnect the call. This has happened with every ICS leak rom I have tried (Liquid, CM nightlys, AOKP nightlys). Any suggestions?