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Thanks for the config, I'll try it soon. In the meantime I got a DP -> HDMI cable and that fixed the issue, although I still have some screen flashing at boot. Also, I moved to Mojave, as it's the last one supported on MacPro5,1.

Hi, new user here :) Trying to get Catalina to boot on an old X58 system (P6T WS PRO, X5675, 48GB RAM). Would you mind sharing your config? I tried everything on this forum already but can't get past the initial boot, I always get a black screen.