Lost-Entrepreneur439 Posted August 2, 2023 Share Posted August 2, 2023 On one computer I have, after the line IOConsoleUsers: gIOScreenLockState 3, hs 0, bs 0, now 0, sm 0x0, my screen will go black (not turn off, it'll just be black) if I attempt to boot High Sierra or later. I've tested High Sierra, Catalina, and Big Sur, they all have this behaviour. For all of them, this is macOS recovery, I can't test the actual OS since I can't install it. I've tested El Capitan and Sierra, they both work fine, and I currently have Sierra installed. Is anyone aware of a solution? Specs - MSI P55A-G55, Intel Core i5-750, 1x8GB 1666MHz ADATA DDR3, PowerColour Radeon HD 7870 GHz Edition 2GB, Western Digital Black 1TB 7200RPM, Realtek ALC892, Realtek RTL8168D/8111D EFI.zip Link to comment Share on other sites More sharing options...
Administrators Hervé Posted August 2, 2023 Administrators Share Posted August 2, 2023 Graphics initialisation issue. Try and add boot-arg radpg=15. https://github.com/acidanthera/WhateverGreen/tree/master Check which AMD personality is selected in El Capitan/Sierra and try to inject this through properties in your config for High Sierra or later. Or experiment with the various personalities that apply to AMD 7xxx cards.. Link to comment Share on other sites More sharing options...
Lost-Entrepreneur439 Posted August 2, 2023 Author Share Posted August 2, 2023 radpg=15 had no effect. How would I figure out which AMD personality is selected in Sierra and how would I inject them? Link to comment Share on other sites More sharing options...
Administrators Hervé Posted August 2, 2023 Administrators Share Posted August 2, 2023 You'll see it in IOreg with apps such as IORegistryExplorer. Link to comment Share on other sites More sharing options...
Lost-Entrepreneur439 Posted August 2, 2023 Author Share Posted August 2, 2023 That's half of a question answered, IORegs are quite big, where exactly do I look in my IOReg? And I still don't know how to inject the properties Link to comment Share on other sites More sharing options...
Administrators Hervé Posted August 3, 2023 Administrators Share Posted August 3, 2023 Look at the properties listed under your AMD graphics card device. Can't say what and where it'll be on your desktop computer. Alternatively, save your IOReg from the app, zip it and attach it. Link to comment Share on other sites More sharing options...
Lost-Entrepreneur439 Posted August 3, 2023 Author Share Posted August 3, 2023 Here's the IOReg Ella’s iMac.zip Well, I've made a discovery, it's just the DVI and HDMI outs on the graphics card that aren't working. If I use a Mini DisplayPort out, it'll work. I do want to fix HDMI though since my monitor only supports DVI and VGA (i always use a DVI to HDMI adapter, since I don't have a direct DVI cable), so because of this I have to use 3 different video adapters (DVI to HDMI, HDMI to DisplayPort, DisplayPort to Mini DisplayPort), and due to that my video quality is worse, I get graphical glitches, sometimes my monitor just doesn't turn on at all. I'll install Big Sur now, but I'll keep Sierra on a separate HDD just in case I need Sierra to troubleshoot something Link to comment Share on other sites More sharing options...
Administrators Hervé Posted August 3, 2023 Administrators Share Posted August 3, 2023 Didn't catch the personality used but you may try and inject any of the following ones that may apply: Link to comment Share on other sites More sharing options...
Lost-Entrepreneur439 Posted August 4, 2023 Author Share Posted August 4, 2023 Alright, how would i inject one of those? Link to comment Share on other sites More sharing options...
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