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Dual Monitors not Working in High Sierra

AMD High Sierra RX 580 Booting Monitors 7700k Z270MX

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#1
Gogeta5026

Gogeta5026

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I have:
Intel Core i7 7700K 4.2 Ghz
Gigabyte GA-Z270MX/Gaming 5
Samsung CF791 Series 34-Inch Curved Widescreen Monitor (C34F791)  3440x1440 4K
Samsung U28E590D 28-Inch UHD LED-Lit Monitor with Freesync support  3840x2160 4K
XFX AMD Radeon™ RX 580 8GB 256 Bit GDDR5 Graphics Card
 
Both monitors are hooked up through Display Port
Sierra works fine and I get full 4K off both monitors and everything works. However....
With High Sierra
I can only boot into High Sierra with 1 of the monitors turned on. Whenever I turn on the 2 monitor everything freezes within High Sierra and screen goes gray. I can still see the desktop but can't click on anything. 
 
Anybody know what I can do to get both monitors working fully in 4K? 
 
Some Success
-------------
After 2 days of constant testing with no luck. I think the problem has something to do with the AMD .kexts in S/L/E. When I copied the AMD .kexts from Sierra to High Sierra I got weird colors (red & blues flipped) and the 2nd monitor will go on and not lock up the computer
 
Even though the method of copying kexts somewhat worked... It made the graphics choppy and everything was running slow (open windows and programs).
 
Is there a FakeID (FB Name, NVCAP,  VRAM, Video Ports, Display-cfg, ig-platform-id, BootDisplay) of some sort I can use in Clover to fix this? Kext?
 
 
My clover config is attached if that helps anybody!
Also...
The 2 pictures attached are what happens. Boots with 1 monitor on. As soon as the 2nd monitor is turned on or plugged in... The working monitor goes black and everything stops responding.

Attached Files



#2
droples

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@Gogeta5026.

I use the Lilu and the WhateverGreen

http://www.insanelym...rocess-patcher/

https://github.com/v...rGreen/releases

and I don't have such problems. But I have installed RX-560 and my monitors are not so powerful.

Maybe worth a try?

Spoiler


#3
Gogeta5026

Gogeta5026

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@Gogeta5026.

I use the Lilu and the WhateverGreen

http://www.insanelym...rocess-patcher/

https://github.com/v...rGreen/releases

and I don't have such problems. But I have installed RX-560 and my monitors are not so powerful.

Maybe worth a try?

Spoiler

Are you using any commands when you boot? Like -lilubeta or something along those lines. Did you place the Lilu and the WhateverGreen kexts in S/L/E or in your Clover EFI?



#4
droples

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Are you using any commands when you boot? Like -lilubeta or something along those lines. Did you place the Lilu and the WhateverGreen kexts in S/L/E or in your Clover EFI?

I don't use /S/L/E for Lilu.kext and WhateverGreen.kext.They are /EFI/Clover/kexts/Other.

Spoiler

 

For Lilu1.1.7 and above

<key>Arguments</key>
<string> darkwake=0 -lilubetaall -rad24</string>

In addition ... if you use .../Other  

<key>SystemParameters</key>
<dict>
<key>InjectKexts</key>
<string>Yes</string>
......


#5
Gogeta5026

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I don't use /S/L/E for Lilu.kext and WhateverGreen.kext.They are /EFI/Clover/kexts/Other.

Spoiler

 

For Lilu1.1.7 and above

<key>Arguments</key>
<string> darkwake=0 -lilubetaall -rad24</string>

In addition ... if you use .../Other  

<key>SystemParameters</key>
<dict>
<key>InjectKexts</key>
<string>Yes</string>
......

Right now...  I'm 98.9% sure that both kexts are in /S/L/E and /EFI/Clover/kexts/Other.

 

I'll try your way when I get home from work in about 6-7 hours. THANK YOU!



#6
Gogeta5026

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I don't use /S/L/E for Lilu.kext and WhateverGreen.kext.They are /EFI/Clover/kexts/Other.

Spoiler

 

For Lilu1.1.7 and above

<key>Arguments</key>
<string> darkwake=0 -lilubetaall -rad24</string>

In addition ... if you use .../Other  

<key>SystemParameters</key>
<dict>
<key>InjectKexts</key>
<string>Yes</string>
......

Just gave it a shot. NO LUCK. :(
The 2 pictures attached are what happens. Boots with 1 monitor on. As soon as the 2nd monitor is turned on or plugged in... The working monitor goes black and everything stops responding.

Attached Files



#7
Hector M. Wilde

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Just gave it a shot. NO LUCK. :(
The 2 pictures attached are what happens. Boots with 1 monitor on. As soon as the 2nd monitor is turned on or plugged in... The working monitor goes black and everything stops responding.

Hey, i have same problem with HD7950 one screen 1920x1080 works (HDMI) 2 screen same as you saying (out of range) (DVI-I). :( 








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