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Enabling GT 650M (Optimus Disabled via BIOS)


kenia1234
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Hi all.

 

I own a laptop (ASUS N56VZ) very well hackintoshed.

Pretty much everything works, except the external video ports (HDMI,VGA).

Here are some specs : Intel i7 3630Q, Chipset HM67, nVidia GT650M, Intel HD4000

 

Unfortunately with OSX Mavericks, VGA can't be used anymore on HD4000, and I need to use an external monitor for work. The HDMI port is dedicated to the nVidia card, so the only way to have it was to disable the Integrated Graphics and use only Nvidia.

Of course the system uses nVidia optimus engine for the switching mechanism, but I found a way to disable it via BIOS and use discrete graphics only (since I use it as a desktop replacement)

 

It works very well on windows (HDMI only) of course but not on OSX unfortunately!!

nVidia GT 650m appears to be loading ok (kext loaded and registered), but that's all! it does not go on.

 

The weird thing is that I can't even boot into safe mode (-x) unless I delete nvidia drivers.

 

Is there anybody who can help me?

 

Here's what I did :

 

-I tried both Clover and Chameleon, InjectNvidia on/off GraphicsEnabler on/off.

-Installed 10.9 nVidia drivers over 10.9.2

-booted with and without my DSDT

 

If you need any other kind of info to help me out just ask!!

 

Thanks in advance!

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Actually I disabled nVidia Optimus and integrated HD 4000 (low performances) via BIOS and so now I have just nVidia GT 650M enabled.

I made some discoveries and maybe someone could help.
At first I thought my system just did not start, then I realized that even if I was stuck at the Apple logo on the external HDMI monitor (LVDS won't work because connected to HD4000), the system underneath was running pretty fine!
So I decided to install a VNC application and manage to extract an IOReg.
my graphic card appears to be detected quite properly (VRAM was 4096mb instead of 256mb) and has full acceleration on VNC screen. Now I just don't understand why it does not work on my external monitor!
If anybody could help it would be great!!
Thanks in advance!
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  • 3 weeks later...

I have the N56VM, how did you manage to disable Optimus via BIOS?

 

Well...actually you need to modify your BIOS by enabling some hidden options.

The biggest problem is that even if it boots, OSX can't detect any attached display and you can just use it through VNC. :/

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  • 7 months later...
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