[Q][PRO]- backlight keyboard files from cm9 iyokan nightly

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http://forum.xda-developers.com – hi guys, just wanna to ask. recently, i have ported paranoid cm9 xperia arc to xperia pro. now, backlight keyboard is not working. i think there are some missing files from paranoid rom. so, the main question is where the backlight keyboard files in /system ?. my base rom from cm9 nightly build 2012-9-4. I'm apologize for my bad english. (HowTos)