AudioLab Posted November 4, 2021 Share Posted November 4, 2021 Hello everyone. I apologize if I post a thread that surely finds thousands of answers but I really need your help. I own the pc described with Big-Sur installed. I can't get 2 monitors to work together. Either one goes to hdmi port or the other to Displayport. I tried looking at the guide for port and frame buffer patching. But I didn't understand much about it. All in all, when I modify the config.plist, any entry even one, I get the annoying OC error: 0 failed to load driver (something like that) at startup. Is there any good soul here who can help me understand or modify the config.plist to make my 2 monitors work together again? I share the efi.zip file in the meantime. A thousand thanks. (Modificato)Ripristina originale EFI.zip Link to comment Share on other sites More sharing options...
Moderators Jake Lo Posted November 4, 2021 Moderators Share Posted November 4, 2021 Post IOReg file with the displays connected using IORegistryExplorer.app v2.1 Link to comment Share on other sites More sharing options...
AudioLab Posted November 4, 2021 Author Share Posted November 4, 2021 Thank Jake Lo for your answer. This is my IOReg. IoReg.zip Link to comment Share on other sites More sharing options...
Moderators Jake Lo Posted November 4, 2021 Moderators Share Posted November 4, 2021 Any other version shows as corrupted when I open it with 2.1. It opens if I use version 3.0+ but it doesn't look right. If you look at x86PlatformPlugin, on the right when you expand CPUStates, you'll see all zero's. With 2.1, it'll be in numbers. Anyway, it's my preference. Looking at your IOReg file, I only see 1 display connected to port 6. Is this the HDMI or DP display? Maybe attach one IOReg for each display connected so to determine which port is use for each display type. Just notice your EFI folder has no Config.plist Link to comment Share on other sites More sharing options...
AudioLab Posted November 4, 2021 Author Share Posted November 4, 2021 Ok Jake, attached under the 3 Ioreg made with version 2.1. Each with only one connected display. The strange thing is that when I connect the monitor to DP2 there is no output on the screen and connection with remote app like Anydesk, reports the monitor as integrated, Apple monitor, the system is reported by SMBIOS as IMac 17.1. Now in my efi folder there is a Config.plist file inside the archive. I hope everything is okay and can help for me. Thanks a lot. efi fiolder.zip Ioreg HDMI port.zip ioreg dp port 1.zip Ioreg dp port 2.zip Link to comment Share on other sites More sharing options...
Moderators Jake Lo Posted November 4, 2021 Moderators Share Posted November 4, 2021 Try this Make sure to keep a backup boot disk incase it won't boot config.plist.zip Link to comment Share on other sites More sharing options...
AudioLab Posted November 4, 2021 Author Share Posted November 4, 2021 I have made a bootable usb pen. I will let you knw if it will works. For the moment thank you very much Link to comment Share on other sites More sharing options...
AudioLab Posted November 4, 2021 Author Share Posted November 4, 2021 I have tried but no luck. It boots into recovery OS and usb stop working. I have made a bootable usb pendrive using gibMACOs...then copy EFI Folder inside and replace config.plist with one you linked. Changing displayport I get only blank and black screen. There is some settings I must look at? Link to comment Share on other sites More sharing options...
Moderators Jake Lo Posted November 4, 2021 Moderators Share Posted November 4, 2021 ok, try this one config.plist.zip Link to comment Share on other sites More sharing options...
Administrators Hervé Posted November 4, 2021 Administrators Share Posted November 4, 2021 See if the config settings detailed here can help you. Optiplex 7040 is same family/generation, isn't it? Link to comment Share on other sites More sharing options...
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