issoeocio Posted February 21, 2019 Share Posted February 21, 2019 (edited) RX580, 4G (Vendor: 1002, DeviceID: 67DF): DP, DP, HDMI, HDMI, DVI-D (Orinoco framebuffer) P8P67 EVO (old motherboard, with strange implementation of UEFI. To disable the CSM [or to get the audio working and SpeedStep] I had to modify the bios). CPU: i5 2500 (so... no iGPU) The RX580 is injected through SSDT (attached). MST and AGDC disabled (otherwise it would stuck right after the login screen -- with a black screen and a functional mouse). Two monitors: one Dell 4k on the DP connection and one Samsung S22C301 on the DVI. In both Mojave and High Sierra, I get the desktop image on the second monitor (DVI) only after the computer sleeps. Before the sleep, the two monitors are turned on, but the Samsung (DVI) screens no picture. I have already tried to modify and inject the EDID; established the correct framebuffer and correctly defined connectors. All through SSDT. Also tried different SMBIOS's, enabling or disabling the CSM or load a alternative VBIOS through Clover. Nothing, nada. Does anyone know what can it be? P.S: Since everything is injected by the SSDT, I do not use WhateverGreen. issoeocio’s iMac.ioreg ssdtGFX0.dsl Edited February 21, 2019 by issoeocio 1 Link to comment Share on other sites More sharing options...
issoeocio Posted February 21, 2019 Author Share Posted February 21, 2019 (edited) The problem was the order of the framebuffer connectors: 000400000403000000010101000000001204060100000000 000400000403000000010201000000002205040300000000 000800000402000000010300000000001102010200000000 000800000402000000010400000000002103050400000000 040000000400000000010500000000000000030600000000 000400000001000000014601000000002001000000000000 I changed to: 000400000403000000010201000000001204060100000000 000400000403000000010301000000002205040300000000 000800000402000000010400000000001102010200000000 000800000402000000010500000000002103050400000000 040000000400000000010100000000001000030600000000 000400000001000000014601000000002001000000000000 There is some screen distortions in the process, but in the end activates the DVI monitor. Edited February 21, 2019 by issoeocio 1 Link to comment Share on other sites More sharing options...
luciuxx63 Posted February 27, 2019 Share Posted February 27, 2019 HELP!! I have a Sapphire nitro + 8GB Special edition ... I only see in 1024x760 and 3 (!!!) mega of VRAM. I follow this Post carefully, but I'm not practical about SSDT etc., someone can help me 'Ah, the Motherboard is like yours ... Link to comment Share on other sites More sharing options...
issoeocio Posted February 28, 2019 Author Share Posted February 28, 2019 (edited) Sadly, luciuxx63, my motherboard died short after this post. I have the last EFI folder here. PM me if you want. Edited February 28, 2019 by issoeocio Link to comment Share on other sites More sharing options...
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