04a_FanPatch.txt

#Maintained by: RehabMan for: HP Probook 4x30s/4x40s
# 04a_FanPatch.txt

#
# This fan patch adds a very conservative modification to the normal
# BIOS fan control.  It does not attempt to trick the system into
# thinking that the laptop is arbitrarily cool.  Instead it simply
# avoids some of the annoying ways in which the default HP BIOS
# controls the fan.  Primarily that it ramps up the fan speed too
# agressively, and even when at relatively cool temperatures, it
# runs the fan at one speed above the lowest.
#

# add fan readings and fan control
into device label SMCD remove_entry;
into definitionblock code_regex . insert
begin
Device (SMCD)\n
{\n
    Name (_HID, "FAN00000") // _HID: Hardware ID\n
// ACPISensors.kext configuration\n
    Name (TACH, Package()\n
    {\n
        "System Fan", "FAN0",\n
    })\n
    Name (TEMP, Package()\n
    {\n
        "CPU Heatsink", "TCPU",\n
        "Ambient", "TAMB",\n
        //"Mainboard", "TSYS",\n
        //"CPU Proximity", "TCPP",\n
    })\n
// Actual methods to implement fan/temp readings/control\n
    Method (FAN0, 0, Serialized)\n
    {\n
        Store (\_SB.PCI0.LPCB.EC0.FRDC, Local0)
        If (Local0) { Divide (Add(0x3C000, ShiftRight(Local0,1)), Local0,, Local0) }
		If (LEqual (0x03C4, Local0)) { Return (Zero) }\n
        Return (Local0)\n
    }\n
    Method (TCPU, 0, Serialized)\n
    {\n
        Acquire (\_SB.PCI0.LPCB.EC0.ECMX, 0xFFFF)\n
        Store (1, \_SB.PCI0.LPCB.EC0.CRZN)\n
        Store (\_SB.PCI0.LPCB.EC0.DTMP, Local0)\n
        Release (\_SB.PCI0.LPCB.EC0.ECMX)\n
        Return (Local0)\n
    }\n
	Method (TAMB, 0, Serialized)
	{\n
        Acquire (\_SB.PCI0.LPCB.EC0.ECMX, 0xFFFF)\n
        Store (4, \_SB.PCI0.LPCB.EC0.CRZN)\n
        Store (\_SB.PCI0.LPCB.EC0.TEMP, Local0)\n
        Release (\_SB.PCI0.LPCB.EC0.ECMX)\n
        Return (Local0)\n
	}\n
    Method (FCPU, 0, Serialized)\n
	{\n
		Store (TCPU(), Local0)\n
        // Temp between 35 and 52: hold fan at lowest speed\n
		If (And (LGreaterEqual (Local0, 35), LLessEqual (Local0, 52)))\n
		{\n
			If (\_SB.PCI0.LPCB.EC0.ECRG)\n
			{\n
				Acquire (\_SB.PCI0.LPCB.EC0.ECMX, 0xFFFF)\n
				Store (0x80, \_SB.PCI0.LPCB.EC0.FTGC)\n
				Release (\_SB.PCI0.LPCB.EC0.ECMX)\n
			}\n
		}\n
		Else\n
		{\n
            // Temp 31 or lower, or above 54: put fan into "automatic mode"\n
            // Note: for temps 32, 33, 34 fan stays in whatever mode it was\n
            //  in previously.\n
            // Note: for temps 53, 54 fan stays in whatever mode it was in\n
            //  previously.\n
			If (Or (LLess (Local0, 32), LGreaterEqual (Local0, 55)))\n
			{\n
				If (\_SB.PCI0.LPCB.EC0.ECRG)\n
				{\n
					Acquire (\_SB.PCI0.LPCB.EC0.ECMX, 0xFFFF)\n
					Store (0xFF, \_SB.PCI0.LPCB.EC0.FTGC)\n
					Release (\_SB.PCI0.LPCB.EC0.ECMX)\n
				}\n
			}\n
		}\n
		Return (Local0)\n
	}\n
}\n
end;