Make the Keyboard Backlight work again.

[Ph0rk0z]

I think previously this was for the thinklight? 2 bits, shmoo bits, the driver wants 0x200 and the backlight level. Unfortunately this doesn't want to work on windows and I'm not sure why yet. Maybe something doesn't load or I need to throw the DLL in IDA and find out what is up. I have not worked out events yet.. perhaps windows operates on those more.

[Ph0rk0z]

I think part of the problem with windows is that SMI is used to set the backlight and not the EC. The actual methods don't write to the EC when I looked at the DSDT from X250.

Method (KBLS, 2, NotSerialized)
    {
        Return (SMI (0x14, 0x09, Arg0, Arg1, 0x00))
    }

Method (MLCG, 1, NotSerialized)
                        {
                            Local0 = \KBLS (0x00, 0x00)
                            Return (Local0)
                        }

                        Method (MLCS, 1, NotSerialized)
                        {
                            Local0 = \KBLS (0x01, Arg0)
                            If (!(Local0 & 0x80000000))
                            {
                                If ((Arg0 & 0x00010000))
                                {
                                    \_SB.PCI0.LPC.EC.HKEY.MHKQ (0x6001)
                                }
                                ElseIf (\_SB.PCI0.LPC.EC.HKEY.MHKK (0x00020000))
                                {
                                    \_SB.PCI0.LPC.EC.HKEY.MHKQ (0x1012)
                                }
                            }

                            Return (Local0)
                        }