Disabling NVIDIA Optimus on ASUS U41SV

[Ivan92]

Hi all

 

I got an ASUS U41SV with a discrete NVIDIA graphics card, and I have reached a solution to disable it in OS X.

 

Spec of the laptop

• CPU: Intel Core i5-2410M 2.3 GHz
• Memory: 8GB DDR3 1333 MHz
• Chipset: Intel HM65
• Graphics: Intel HD3000 + NVIDIA GeForce GT540M
• Display: 14" 1366 x 768
• Audio codec: Realtek ALC269
• WiFi: Atheros 9285

 

OS X Configuration

• Niresh's distro of Yosemite
• A whole SSD reserved for OS X
• Chameleon bootloader
• SMBIOS: MacBookPro8,1 (13-inch, Early 2011)
• Updated to 10.10.1 via App Store

 

Disabling Optimus

 

The guide here does not fit this laptop, but after some modifications, it works on U41SV.

• I first extracted DSDT under Windows with AIDA64
• Back to OS X, I used MaciASL to edit the DSDT extracted from Windows
• At the begging of the file, I added the following line:

// ...
DefinitionBlock ("iASLnv4Cgf.aml", "DSDT", 1, "_ASUS_", "Notebook", 0x00000000)
{

    // the line below was added
    External (\_SB_.PCI0.PEG0.GFX0.SGOF, MethodObj) 

// ...

• Then I added the following method before Method (_WAK, 1, Serialized)

// ...
    Method (M_OF, 0, NotSerialized)
    {
        If (CondRefOf (\_SB.PCI0.PEG0.GFX0._OFF))
        {
            \_SB.PCI0.PEG0.GFX0._OFF ()
        }

        If (CondRefOf (\_SB.PCI0.PEG0.GFX0._PS3))
        {
            \_SB.PCI0.PEG0.GFX0._PS3 ()
        }

        If (CondRefOf (\_SB.PCI0.PEG0.GFX0.SGOF))
        {
            \_SB.PCI0.PEG0.GFX0.SGOF ()
        }
    }
// ...

• Then called the method M_OF in the method _WAK

// ...
    Method (_WAK, 1, Serialized)
    {
        M_OF ()  // calling M_OF ()
        WAK (Arg0)
        Return (Package (0x02)
        {
            Zero, 
            Zero
        })
    }
// ...

• And called the method M_OF again in the method _INI

// ...
   Scope (_SB.PCI0)
    {
        Method (_INI, 0, NotSerialized)
        {
            Store (0x07D0, OSYS)
            M_OF ()  // calling M_OF ()
            If (CondRefOf (\_OSI, Local0))
            {
                If (_OSI ("Linux"))
                {
                    Store (0x03E8, OSYS)
                }
// ...

• Finally clicked compile in MaciASL, and saved the DSDT as /Extra/DSDT.aml

 

And now NVIDIA Optimus is disabled.

Edit: HDMI output working, VGA untested, able to adjust brightness of built-in display

 

And here is my edited DSDT.

ASUS-U41SV-DSDT.aml.zip

 

 

Credits

Thanks to Whit3Spirit for the guide here

[vandebergz]

Hello. Thanks for sharing.

I did as you say with a few modifications too to fit my system. Yet I wasn't able to disable NVIDIA on my machine.

Mind lending a hand?
Thank you