Hello Rominator
and some way to disable this port - disable GPU card?
and that start only from the intel HD3000 Integrated?
I do not know if the method they use in the MacBookPro 2011 would work, since my computer is an iMac mid 2011
https://forums.macrumors.com/threads/force-2011-macbook-pro-8-2-with-failed-amd-gpu-to-always-use-intel-integrated-gpu-efi-variable-fix.2037591/sudo nvram fa4ce28d-b62f-4c99-9cc3-6815686e30f9:gpu-power-prefs=%01%00%00%00
or from Linux
printf "\x07\x00\x00\x00\x01\x00\x00\x00"> /sys/firmware/efi/efivars/gpu-power-prefs-fa4ce28d-b62f-4c99-9cc3-6815686e30f9
the problem is that it does not start in any way, for which I can not execute any of these commands.
I have tried to edit the nvram variables of the rom, but without result, I do not know if I will be doing it correctly.
so what I've done, is to extract the rom from the computer and investigate it,
and from here I have extracted the DSDT SSDT files that I am trying to edit ...
I have seen this patch and I have adjusted it to the scheme that I have,
what I do not know if it would work,
// added to turn nvidia / radeon off
If (LAnd (LEqual (Arg0.3), LEqual (Arg1.1)))
{
External (\ _ SB.PCI0.P0P2.GFX0._OFF, MethodObj)
\ _SB.PCI0.P0P2.GFX0._OFF ()
}