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Precision M4800: brightness slider - need help


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I have patched my DSDT:

Device (PNLF)
                        Name (_HID, EisaId ("APP0002"))  // _HID: Hardware ID
                        Name (_CID, "backlight")  // _CID: Compatible ID
                        Name (_UID, 0x0A)  // _UID: Unique ID
                        Name (_STA, 0x0B)  // _STA: Status

And using ACPIBacklight.kext. However I cannot figure out where's my brightness slider?

Please help!



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