any infos about amd 6000x series drivers?
As first, consider that I'm not an expert.
Anyway, just for curiosity, I looked for the PCI id of the 6800/6800xt (not sure but probably the PCI ID is 0x73bf while AMD is 0x1002) and the name "Navi21" (if I understood well RX6800 and 6800 XT are "Navi 21") in /System/Library/Extensions and I found something:
MM2018-2:Extensions root# grep -IRi Navi21 *
AMDRadeonX6000Framebuffer.kext/Contents/Info.plist: <key>AMDRadeonNavi21Controller</key>
AMDRadeonX6000Framebuffer.kext/Contents/Info.plist: <string>AMDRadeonX6000_AmdRadeonControllerNavi21</string>
MM2018-2:Extensions root# grep -B1 -IRi 0x73bf1002 *
AMDRadeonX6000Framebuffer.kext/Contents/Info.plist- <key>IOPCIMatch</key>
AMDRadeonX6000Framebuffer.kext/Contents/Info.plist: <string>0x73101002 0x73121002 0x73181002 0x73191002 0x731A1002 0x731B1002 0x731F1002 0x73BF1002 0x73601002 0x73621002 0x73401002 0x73411002 0x73431002 0x73471002 0x734F1002 0x73A01002 0x73A21002 0x73A31002 0x73AB1002 0x73AE1002 0x73BF1002 0x73C01002 0x73C11002 0x73C31002 0x73DF1002 0x73E01002 0x73E11002 0x73E21002 0x73FF1002</string>
--
AMDRadeonX6000Framebuffer.kext/Contents/Info.plist- <key>IOPCIMatch</key>
AMDRadeonX6000Framebuffer.kext/Contents/Info.plist: <string>0x73101002 0x73121002 0x73181002 0x73191002 0x731A1002 0x731B1002 0x731F1002 0x73BF1002</string>
--
AMDRadeonX6000Framebuffer.kext/Contents/Info.plist- <key>IOPCIMatch</key>
AMDRadeonX6000Framebuffer.kext/Contents/Info.plist: <string>0x73A01002 0x73A21002 0x73A31002 0x73AB1002 0x73AE1002 0x73BF1002</string>
Don't know if this means that they are working on it...
Bye,
Mr Hyde