if it happens on stock jb its a hw prob not a cm prob
read this http://forum.xda-developers.com/showthread.php?t=2413314
Yes I have read it tried it, and no success.
But how come it is only HW problem?
If it is ok on stock ICS and MIUI,...
I noticed a bug at the alarms screen, I can't see the alarms settings like time and recurrence days.