Using GPU HDMI I now manage to get a consistent signal on the flat screen now but only if I downgrade the image: I must set to 50 Hz and a lower resolution than the screen's default, in other words, standard definition .
My TV does not have Deep color or HDR, etc. It’s not 4K. I’ve checked and rechecked TV settings and manual. Like I say, it worked with previous build.
I feel like something isn’t set right, the same TV worked with same cable etc with my previous build which had much less powerful GPU. In system report is see Radeon RX 5500 XT 8 GB which is correct. How do I check to make sure the right driver is being loaded. The system report shows AMDRadeonX6000.kext loaded.
Anything I can check in IORegistry? Do I need to modify SSDT?
Thanks