High Sierra AMD HD7xxx black screen

[GET2112]

I have both DVI and HDMI cables (I'm using dual monitors), none of them work.
I didn't try those boot args except below and all failed:
- GraphicsEnabler=No -v
- ilubeta -shikivga
- lilubetaall radpg=15
- Inject ATI kext
- Whatevergreen + lilu kexts inside /EFI/Clover/kexts/Other (on USB High Sierra Installer, not HDD)

I had similar problem, this is my setting, you can have a try
BIOS:
- disable iGPU
CLOVER:
- radpg=15
- DO NOT inject anything
- Put Whatevergreen + lilu kexts inside /EFI/Clover/kexts/Other

And then, the magic Happened.

 

[marzillo]

rollback of this kext to sierra to high sierra



AMDRadeonX4000.kext

AMDRadeonX4000GLDriver.bundle

IOAccelerator2D.plugin

IOAcceleratorFamily2.kext .



then



sudo rm -f /System/Library/Caches/com.apple.kext.caches/Startup/kernelcache && sudo touch /System/Library/Extensions && sudo kextcache -u /



work to me with 7750 and 7950

 

[nickw1978]

Well between nvidia and ati drivers that seem to not work at all. I can honestly say that high sierra is the worst version of mac os to date. I get KPs with nvidia cards that worked in elcapitan and I get black screens with every AMD graphics card I own except for me amd 4670. WTH Apple?

 

[DmitryX]

AMDRadeonX4000.kext

AMDRadeonX4000GLDriver.bundle

IOAccelerator2D.plugin

IOAcceleratorFamily2.kext .

post files please,

 

[marzillo]

of course

 

[DmitryX]

of course

Thank you!