Black Screen Dual GPU

[Redmac]

Hi Guys,

maybe someone can help.
I run to GPUs one for Win and one for Mac.
The Nvidia one is disabled - I am using opencore.

Normally the nvidia is plugged to the screen via DP and the Radeon via HDMI.
The Nvidia turns on by default as primary and i choose e.g. in the OC Picker MacOS.
Then I switch to HDMI and the Hack is there.

But now, i got just a black screen when any cable is plugged to the nvidia card.
The Mac OS is booted, cuz i can do screenshots and on the screenshots is not a black screen.

So when i boot with just the radeon attached to the screen i got a visual without any issues.

What can i do?

 

[Jamesbond007]

Hi Guys,

maybe someone can help.
I run to GPUs one for Win and one for Mac.
The Nvidia one is disabled - I am using opencore.

Normally the nvidia is plugged to the screen via DP and the Radeon via HDMI.
The Nvidia turns on by default as primary and i choose e.g. in the OC Picker MacOS.
Then I switch to HDMI and the Hack is there.

But now, I got just a black screen when any cable is plugged to the nvidia card.
The Mac OS is booted, cuz I can do screenshots and on the screenshots is not a black screen.

So when i boot with just the radeon attached to the screen i got a visual without any issues.

What can I do?

Please update your motherboard and CPU information in your Personal Details as stipulated by the forum rules.

Has anything changed since you were able to get it working?

 

[Redmac]

Done- sorry!
It was working before i changed the Mainboard and with OC 0.65 and Big Sur around one update ago end of january/beginning of february.

Error shows also Gioscreenlockstate3.

I assume that the config plist need some additional setting to run properly again e.g. show a screen- running is the hack.

My bios is set, there isnt much to configurate.

 

[Redmac]

Thanks anyway.
Disabling Resize Bar in the Bios did the trick!