Radeon HD 7850 and HD7870 and Mojave black screen

[laudou]

I am trying to replace my Nvidia cards installed on my two X99 builds with Radeon graphic cards. After installing the cards, I can boot, enter my password but after the verbose display both computers display a black screen. The graphic card does not seem to receive the proper command from the config.plist,

Can anybody help me?

Thanks

[MaLd0n]

[ref]laudou[/ref], u use a last weg kext version?

[laudou]

I am not using a weg kext version. I only have some specific boot arguments. Where can you find the necessary kexts?

Thanks

Added in 3 minutes 58 seconds:

Sorry! I did not understand "weg" at first. Yes, I am using whatevergreen.

[MaLd0n]

[ref]laudou[/ref], check in weg site if have some specific flag for ur gpu

[laudou]

I updated both whatevergreen and lilu kests to the latest version and I am still getting a black screen right after the verbose screen. I did not see any mention of a specific flag for my gpu on the whatevergreen site.

Any suggestion?

[MaLd0n]

[ref]laudou[/ref], no idea about ur gpu