Gogeta5026 Posted September 18, 2017 Share Posted September 18, 2017 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. config.plist.zip Link to comment https://www.insanelymac.com/forum/topic/327257-dual-monitors-not-working-in-high-sierra/ Share on other sites More sharing options...
droples Posted September 18, 2017 Share Posted September 18, 2017 @Gogeta5026. I use the Lilu and the WhateverGreen http://www.insanelymac.com/forum/topic/321371-lilu-—-kext-and-process-patcher/ https://github.com/vit9696/WhateverGreen/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? 1 Link to comment https://www.insanelymac.com/forum/topic/327257-dual-monitors-not-working-in-high-sierra/#findComment-2496248 Share on other sites More sharing options...
Gogeta5026 Posted September 18, 2017 Author Share Posted September 18, 2017 @Gogeta5026. I use the Lilu and the WhateverGreen http://www.insanelymac.com/forum/topic/321371-lilu-—-kext-and-process-patcher/ https://github.com/vit9696/WhateverGreen/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? WE.jpg 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? Link to comment https://www.insanelymac.com/forum/topic/327257-dual-monitors-not-working-in-high-sierra/#findComment-2496431 Share on other sites More sharing options...
droples Posted September 18, 2017 Share Posted September 18, 2017 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. 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> ...... 1 Link to comment https://www.insanelymac.com/forum/topic/327257-dual-monitors-not-working-in-high-sierra/#findComment-2496518 Share on other sites More sharing options...
Gogeta5026 Posted September 18, 2017 Author Share Posted September 18, 2017 I don't use /S/L/E for Lilu.kext and WhateverGreen.kext.They are /EFI/Clover/kexts/Other. Other.jpg 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! Link to comment https://www.insanelymac.com/forum/topic/327257-dual-monitors-not-working-in-high-sierra/#findComment-2496551 Share on other sites More sharing options...
Gogeta5026 Posted September 18, 2017 Author Share Posted September 18, 2017 I don't use /S/L/E for Lilu.kext and WhateverGreen.kext.They are /EFI/Clover/kexts/Other. Other.jpg 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. 1 Link to comment https://www.insanelymac.com/forum/topic/327257-dual-monitors-not-working-in-high-sierra/#findComment-2496745 Share on other sites More sharing options...
Hectorsky Posted September 26, 2017 Share Posted September 26, 2017 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). Link to comment https://www.insanelymac.com/forum/topic/327257-dual-monitors-not-working-in-high-sierra/#findComment-2500727 Share on other sites More sharing options...
bbmatias3 Posted October 30, 2017 Share Posted October 30, 2017 This you ever figured out this issue?! I was having the same issue but somehow fixed it. I can send my efi later on if anyone need it’s It was actually a kext in clover that was cause it this issue for me I know weird Link to comment https://www.insanelymac.com/forum/topic/327257-dual-monitors-not-working-in-high-sierra/#findComment-2525033 Share on other sites More sharing options...
Gogeta5026 Posted October 30, 2017 Author Share Posted October 30, 2017 I got rid of CsmVideoDxe-64.efi and got everything working 1 Link to comment https://www.insanelymac.com/forum/topic/327257-dual-monitors-not-working-in-high-sierra/#findComment-2525071 Share on other sites More sharing options...
bbmatias3 Posted October 30, 2017 Share Posted October 30, 2017 I got rid of CsmVideoDxe-64.efi and got everything working Okay thanks good to know Link to comment https://www.insanelymac.com/forum/topic/327257-dual-monitors-not-working-in-high-sierra/#findComment-2525074 Share on other sites More sharing options...
bbmatias3 Posted October 30, 2017 Share Posted October 30, 2017 Where would I locate this file to delete? Link to comment https://www.insanelymac.com/forum/topic/327257-dual-monitors-not-working-in-high-sierra/#findComment-2525086 Share on other sites More sharing options...
MorenoAv Posted October 30, 2017 Share Posted October 30, 2017 Where would I locate this file to delete? In the Clover Configurator, you have install drivers it's there, click it and it uninstall, save and its done... Link to comment https://www.insanelymac.com/forum/topic/327257-dual-monitors-not-working-in-high-sierra/#findComment-2525164 Share on other sites More sharing options...
IUTniun Posted October 30, 2017 Share Posted October 30, 2017 Where would I locate this file to delete? CsmVideoDxe-64.efi in drivers64UEFI folder Link to comment https://www.insanelymac.com/forum/topic/327257-dual-monitors-not-working-in-high-sierra/#findComment-2525204 Share on other sites More sharing options...
bbmatias3 Posted October 30, 2017 Share Posted October 30, 2017 It wasn’t there but all I had to do is change my smbios to 6,1 lol it was random but it enabled my second monitor Link to comment https://www.insanelymac.com/forum/topic/327257-dual-monitors-not-working-in-high-sierra/#findComment-2525437 Share on other sites More sharing options...
shazeal Posted October 30, 2017 Share Posted October 30, 2017 I had this same issue with my RX 480, after upgrade to Sierra only one monitor worked. Was using 2 x Display Port connections. Tried using Lilu/Whatevergreen with no result. Previously I was using patched BIOS to work without helper GPU which also did not work. Disabling CSM made no difference. Only solution was to change to HDMI cable for second monitor and even then only 1 of the 2 HDMI ports will work. It wasn’t there but all I had to do is change my smbios to 6,1 lol it was random but it enabled my second monitor Were you previously on iMac SMBIOS? Could be to do with the built in display causing this issue EDIT: Confirmed this works for me, can now use 2 x Display port again, and all other ports work normally. I was previously using iMac 17,1 Link to comment https://www.insanelymac.com/forum/topic/327257-dual-monitors-not-working-in-high-sierra/#findComment-2525461 Share on other sites More sharing options...
bbmatias3 Posted October 30, 2017 Share Posted October 30, 2017 I had this same issue with my RX 480, after upgrade to Sierra only one monitor worked. Was using 2 x Display Port connections. Tried using Lilu/Whatevergreen with no result. Previously I was using patched BIOS to work without helper GPU which also did not work. Disabling CSM made no difference. Only solution was to change to HDMI cable for second monitor and even then only 1 of the 2 HDMI ports will work. Were you previously on iMac SMBIOS? Could be to do with the built in display causing this issue EDIT: Confirmed this works for me, can now use 2 x Display port again, and all other ports work normally. I was previously using iMac 17,1 nice!!! yeah me too i was on 17,1 i just read somewhere to change to 6,1 nice!!! yeah me too i was on 17,1 i just read somewhere to change to 6,1 Link to comment https://www.insanelymac.com/forum/topic/327257-dual-monitors-not-working-in-high-sierra/#findComment-2525474 Share on other sites More sharing options...
inequals Posted November 14, 2017 Share Posted November 14, 2017 I'm having this same issue. Tempted to try changing the system definition in SMBIOS (I'm using 18,1), but won't that freak out iCloud/AppleID/iMessage etc? I've got mine all working so nicely... But then I would like my second monitor to work........ Hmmm Link to comment https://www.insanelymac.com/forum/topic/327257-dual-monitors-not-working-in-high-sierra/#findComment-2534846 Share on other sites More sharing options...
bbmatias3 Posted November 14, 2017 Share Posted November 14, 2017 I'm having this same issue. Tempted to try changing the system definition in SMBIOS (I'm using 18,1), but won't that freak out iCloud/AppleID/iMessage etc? I've got mine all working so nicely... But then I would like my second monitor to work........ Hmmm Yeah that’s tricky I have ryzen so iMessages don’t work for me Link to comment https://www.insanelymac.com/forum/topic/327257-dual-monitors-not-working-in-high-sierra/#findComment-2534857 Share on other sites More sharing options...
madicineman Posted August 29, 2018 Share Posted August 29, 2018 Interesting read: https://forums.macrumors.com/threads/amd-polaris-vega-gpu-macos-support.2083168/ Link to comment https://www.insanelymac.com/forum/topic/327257-dual-monitors-not-working-in-high-sierra/#findComment-2632261 Share on other sites More sharing options...
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