I have updated my HDMI lead to a DisplayPort for my main monitor and wanted to use my Blackmagic videography monitor to colour grade. However, when I connect the HDMI lead, the main DisplayPort monitor keeps refreshing in a sort of screen bootloop and the HDMI monitor doesn't work. This is on a 6600 XT OpenCore build. DisplayPort works fine. HDMI seems to work solo on the main monitor, but not the balckmagic monitor. I have tried the Blackmagic monitor on my M1 macbook and Windows 11 install (on the same desktop) – both work fine.
I have received a "com.apple.extensionKit.errorDomain error 15" error message sometimes.
I wiped the NVRAM, but to no avail.
Any suggestions very welcomed.
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