I've been having this issue since i switched from stock ROM to CyanogenMod 10.
When there is an incoming call on my phone, screen doesn't wake up, stays black (dark),doesn't light up, so I can't see who is trying to reach me and i also can't accept or decline the phonecall.
I've searched the internet, xda forum mostly, and i've found this thread
Same issue, and moreover, one of the users mentioned.
"It has been fixed, see the custom CM10 thread. I don't have this issue anymore."
So i've search the thread which has been advised, but couldn't find the proper answer for this bug.
Can somebody advise ? Thanks a lot.