@Feartech I also read that, but in some old thread I read that you could use that boot arg to solve black screen issues. I tried it as my to monitors where connected with one dp-cable and one dvi-cable with dp-adapter and that gave me problems with black screen and two different resolutions although the monitors are same model. Bought another dp-cable yesterday and like magic I got same res and could take away agdpmod=pikera from my bootargs. Sleep works perfect now and no black screens .
@ DarJok I was wondering about the necessity of vegagraphics fixup kext as I never had to use it, why do you need it? And have you tried to inject your vega 56 as a device with powerplaytable in stead of using vegatab kext?
As I am on OpenCore and not Clover I can't tell you how to do that but I can share my device settings for my vega.
These settings are from many different contributors here on tonymac so thank you all for sharing. Hope this can help you
(Sorry for bad grammar as english is not my native language)
<key>DeviceProperties</key>
<dict>
<key>Add</key>
<dict>
<key>PciRoot(0x0)/Pci(0x1,0x0)/Pci(0x0,0x0)/Pci(0x0,0x0)/Pci(0x0,0x0)</key>
<dict>
<key>@0,device_type</key>
<string>display</string>
<key>@0,name</key>
<string>ATY,Kamarang</string>
<key>@1,device_type</key>
<string>display</string>
<key>@1,name</key>
<string>ATY,Kamarang</string>
<key>@2,device_type</key>
<string>display</string>
<key>@2,name</key>
<string>ATY,Kamarang</string>
<key>@3,device_type</key>
<string>display</string>
<key>@3,name</key>
<string>ATY,Kamarang</string>
<key>AAPL,boot-display</key>
<data>AQAAAA==</data>
<key>ATY,DeviceID</key>
<data>f2g=</data>
<key>ATY,EFIDriverType</key>
<data>Ag==</data>
<key>ATY,EFIEnabledMode</key>
<integer>1</integer>
<key>ATY,EFIVersion</key>
<data>MDEuMDAuMzE4MA==</data>
<key>ATY,EFIVersionB</key>
<data>MTEzLUQwNTAwMzAwLTEwMQ==</data>
<key>ATY,Rom#</key>
<string>113-D0500300-101</string>
<key>ATY,copyright</key>
<data>Q29weXJpZ2h0IEFNRCBJbmMuIEFsbCBSaWdodHMgUmVzZXJ2ZWQuIDIwMDUtMjAxOQ==</data>
<key>CFG_NVV</key>
<integer>2</integer>
<key>CFG_PTPL2_TBL</key>
<data>0gAAAMwAAADGAAAAwAAAALoAAAC0AAAAqgAAAKAAAACWAAAAjAAAAIIAAAB4AAAAbgAAAGQAAABaAAAAHgAAAA==</data>
<key>Force_Load_FalconSMUFW</key>
<integer>1</integer>
<key>PP_ACDCGpioDisabled</key>
<integer>0</integer>
<key>PP_DiDtSQPatternWidthOverride</key>
<integer>14</integer>
<key>PP_DiDtSQStallPatternOverride</key>
<integer>16383</integer>
<key>PP_DisableAutoWattman</key>
<integer>0</integer>
<key>PP_DisableClockStretcher</key>
<integer>1</integer>
<key>PP_DisableDIDT</key>
<integer>1</integer>
<key>PP_DisablePCCLimitControl</key>
<integer>1</integer>
<key>PP_DisablePowerContainment</key>
<integer>1</integer>
<key>PP_DisableULV</key>
<integer>1</integer>
<key>PP_EnableUploadFirmware</key>
<integer>0</integer>
<key>PP_Falcon_QuickTransition_Enable</key>
<integer>1</integer>
<key>PP_FuzzyFanControl</key>
<integer>0</integer>
<key>PP_GfxOffControl</key>
<integer>0</integer>
<key>PP_PhmSoftPowerPlayTable</key>
<data>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</data>
<key>PP_PhmUseDummyBackEnd</key>
<integer>0</integer>
<key>PP_ToolsLogSpaceSize</key>
<integer>524288</integer>
<key>PP_WorkLoadPolicyMask</key>
<integer>1</integer>
<key>device_type</key>
<data>QVRZLEthbWFyYW5nUGFyZW50</data>
<key>hda-gfx</key>
<string>onboard-1</string>
<key>model</key>
<string>AMD Radeon RX Vega 56</string>
<key>name</key>
<string>ATY,KamarangParent</string>
</dict>
</dict>