Can't duplicate monitors since switching to extending

[Ark-A239]

Hello LTT Community!

 

I have a 2 PC setup for streaming and recording. My GPU in the gaming PC is connected to my gaming monitor and to a capture card which is in the streaming PC.

I switched to extending the "monitors" because the Monster Hunter Rise Demo wouldn't run otherwise. This is not the first time I turned duplication off, but I never had this issue before. I am certain that I did not change anything else.

 

I have tried the following:

• Restarting both PCs
• Updating drivers (uninstall with DDU in safe mode, clean install without network connection)
• Unplugging and replugging every cable
• Removing the overclock on gaming PC
• Reducing resolutions and refresh rates of both the monitor and the capture card
• Screaming

If I try it in the "Display Settings" it just says "The display settings could not be saved. Please try a different combination of display settings."

If I try it in the NVIDIA Control Panel, via "Clone with  >" it just disables the selected monitor (the checkmark is removed)

 

I have searched in this forum and on google, but I coulnd't find anything useful so far. I am at my wits end and hope that someone here could help me out.

 

PC Specs:

Gaming PC:

• 2080 Ti (watercooled with NZXT Kraken G12)
• Ryzen 5 5600X, air cooled with Scythe Fuma 2
• 16 GB, 3600 RAM
• X570 ITX Mobo from Asus
• SF750 SFX PSU from Corsair
• M.2 SSD Storage
• Samsung Odyssey G7, 1440p 240Hz Monitor

Streaming PC:

• Quadro M4000 GPU
• Ryzen 7 1700
• 32 GB, 3200 RAM
• X470 mATX Mobo from Gigabyte
• 550W EVGA PSU
• Mix of SSD and HDD Storage
• Elgato 4k60 Pro mk2

[Ark-A239]

I resolved the issue in the NVIDIA Control Panel by:

1. disabling the capture card and applying the setting (so there is only 1 output)
2. enabling the capture card, not applying settings
3. cloning, THEN applying settings