I'm having trouble with my R7-250X on Sierra and High Sierra.

So I was working on this the whole weekend, and I'm at work away from my computer, but I will give as much detail that I can think about. If you have questions, please let me know.

  • i7-3770 (iGPU Intel HD4000)
  • Asus P8B75-M
  • 16GB RAM
  • XFX R7-250X

So if I run the computer with the iGPU as primary, then the computer boots up just fine. Everything works as intended, but I need the 250X so that I can run 4K@60Hz.

When I run the 250X, I am able to install Sierra, but when I boot, I get these messages, with the last one (so someone in the future can search for this):


IOConsoleUsers: gIOLockScreenState 3, hs 0, bs 0, now 0, sm 0x0

The only Google searching I could find relate to iGPU problems, so I guess I've having the exact opposite?

I've tried:

  • Upgrading BIOS
  • Using ASUS, MSI, and Gigabyte VBIOS files
  • Safe mode, single user mode
  • WhateverGreen with radpg=15 and -lilubetaall boot flags
  • Booting off USB-only or straight from HDD
  • Replacing 250X with Quadro 410 to check PCI-E port (Quadro works perfect)
  • Changing all GPU-related options on my BIOS.

So if anyone has any ideas or hints, I would appreciate it.

submitted by /u/RedTib
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