To disable nVidia try to insert
\_SB.PCI0.PEG1.GFX0._OFF ()
into \_SB.PCI0._INI
Scope (_SB.PCI0)
{
Method (_INI, 0, NotSerialized)
{
\_SB.PCI0.PEG1.GFX0._OFF ()
Store (0x07D0, OSYS)
...
If it turns on again after sleep, insert it also into _WAK
Method (_WAK, 1, Serialized)
{
\_SB.PCI0.PEG1.GFX0._OFF ()
WAK (Arg0)
...