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Please help me fix my DSDT. I want to patch my DSDT to fix brightness but i've never done this before so I don't know how to. Whenever I try to patch with RehabMan's patch, I get many syntax errors.. Please help.. I am attaching my DSDT..

I have OSX Yosemite 10.10 installed.. I have a Realtek ALC255 card which is not working.. any help in fixing it will be really appreciated.. Please tell me what to do.. I'm using Chimera 4.1.0..