No AMD changes in 10.12.4 beta 3
NOT TRUE,
cause we have another Framebuffer within AMD9510Controller.kext:
-------------------------AMD9510Controller.kext-------------------------
Exmoor (6) @ 0x106070
LVDS, LVDS, DP, DP, DP, DP
020000000001000000010151000000002205020400000000
020000000001000000010261010000001204010300000000
000400000403000000010343000000001102030100000000
000400000001000000010431000000002103050500000000
000400000403000000010523000000001000040200000000
000400000001000000010611000000002001050500000000
Berbice (5) @ 0x106100
LVDS, DP, DP, DP, DP
020000000001000039050108000000002001010100000000
000400000001000000010243000000001000020200000000
000400000403000000010313000000002103030300000000
000400000403000000010453000000001102040400000000
000400000403000000010533000000001204050500000000
BerbiceA (5) @ 0x1062b0
LVDS, DP, DP, DP, DP
020000000001000039050108000000002001010100000000
000400000001000000010243000000001000020200000000
000400000403000000010313000000002103030300000000
000400000403000000010453000000001102040400000000
000400000403000000010533000000001204050500000000
Baladi (6) @ 0x106370
DP, DP, DP, DP, DP, DP
000400000403000000010300000000001204030300000000
000400000403000000010100000000001102010100000000
000400000403000000010200000000002103020200000000
000400000403000000010400000000002205040400000000
000400000403000000010500000000001000050500000000
000400000403000000010600000000002001060600000000
-----------------------------------------------------------------------------
and we have a new kext for AMD: AMDLegacySupport.kext
with some interesting codesnippet:
<key>IOPCIMatch</key>
<string>0x94C81002 0x95831002 0x95881002 0x95011002 0x95531002 0x95401002 0x94901002 0x94881002 0x94401002 0x944a1002 0x68981002 0x68991002 0x68E01002 0x68E11002 0x68D81002 0x68C01002 0x68C11002 0x68D91002 0x68B81002 0x68B01002 0x68B11002 0x68A01002 0x68A11002 0x67681002 0x67701002 0x67791002 0x67601002 0x67611002 0x67501002 0x67581002 0x67591002 0x67401002 0x67411002 0x67451002 0x67381002 0x67391002 0x67201002 0x67221002 0x67181002 0x67191002 0x68401002 0x68411002 0x67041002</string>
Of cause i allready tried to insert RX480 ID "0x67DF1002" into it... and YES, it gets loaded than. But all it does is just this:
So i thought, i just disable IGPU, set CSM to boot legacy and restartetd...
but SORRY, nothing has changed, connected screens still stay black. But was worth a try.