Default minimum brightness level

on cm9
how to reduce minimum brightness to 1 ? I know root dim can do that..am looking for native solution
THANK ME IF I HELPED.....

Device : Samsung Galaxy s captivate kitkat with xposed framework

Device : LG OPTIMUS L3
Rom :CYANOGENMOD 9 ICS 4.0.4 with XPOSED FRAMEWORK and OVERCLOCK 1GHz with RAM EXPANDER