- Joined
- Feb 5, 2013
- Messages
- 1,299
- Motherboard
- Asus Z790-plus
- CPU
- i7-12700K
- Graphics
- RX 6900 XT
- Mac
@todadqa,
Check that you have the correct framebuffer assigned for your AMD card, according to the guide it should be "Lagotto" for AMD R9 285.
You can look in the ioreg to check the current frame buffer, for most AMD GPU's it's under GFX0 -> Device_Type.
If your DVI Monitors are 1080P or higher then you must make sure the DVI ports are running in dual-link mode.
Installing Lilu + WhatEverGreen should be enough to ensure the correct AMD framebuffer is used and that the "RadeonDeInit" flag is set, it should also enable DVI dual-link.
If you dont already have Lilu + WhatEverGreen installed then you should try that first.
Alternatively you can use Clover (in which case do not use WhatEverGreen) to manually set all three parameters :-
View attachment 414773
I dont have a AMD R9 285 GPU to test with but if you follow the recommended settings from post #1 it should work.
Cheers
Jay
Hey, Jay:
Wondering if you give me some help. On my Z370, 9900k system with my Vega 56, I can't use HDMI. I get a black screen at the end of the boot (on either Mojave or Catalina - doesn't matter which, black screen). I am using the very latest Lilu and Whatevergreen. I can remote desktop to it, and that will work for now, but I was hoping that HDMI would work on my AOC monitor.
Any ideas?