maimoy

No I am using it wired with the internal ethernet and i didn't search for a solution about wifi.

Thank you for your detailed technical answer. I will keep searching, testing and hoping to find a workarround or or hack on this. Currently i am using it with two displays one in hdmi port, and also even the drivers of nvidia are loaded i haven't notice any extra heating or power consumption to need nvidia chip disabled. Than you.

Unfortunately there is no Bios Setting to let me disable the internal processors graphics card. I have installed nvidia web drivers and as i am seeing from system->extensions they are loaded. In GLView.app i am not seeing it in the list of available options. Only if there is an option from editing dsdt could be possible.

Have you managed to have nvidia card working in Yosemite? I have it installed in a USB3 16gb as main disk, working the intelHD4400 normally but i havent't find any way to use the nvidia instead of intel. I have the same laptop as you but with bios A04 revision and i5 cpu (haswell) Thanks?