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 https://www.insanelymac.com/forum/topic/337699-solved-sapphire-rx580-dvi-screen-only-after-sleep/ 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 https://www.insanelymac.com/forum/topic/337699-solved-sapphire-rx580-dvi-screen-only-after-sleep/#findComment-2664887 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 https://www.insanelymac.com/forum/topic/337699-solved-sapphire-rx580-dvi-screen-only-after-sleep/#findComment-2665462 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 https://www.insanelymac.com/forum/topic/337699-solved-sapphire-rx580-dvi-screen-only-after-sleep/#findComment-2665544 Share on other sites More sharing options...
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