Not been able to make anymore progress. Just wondering why id 19260000 since according to link below this relates to Intel Iris Graphics 540:
https://www.insanelymac.com/forum/topic/334899-intel-framebuffer-patching-using-whatevergreen/
I've already checked these out but will do so again.
ID: 191B0000, STOLEN: 34 MB, FBMEM: 21 MB, VRAM: 1536 MB, Flags: 0x0000110F
TOTAL STOLEN: 56 MB, TOTAL CURSOR: 1 MB (1572864 bytes), MAX STOLEN: 124 MB, MAX OVERALL: 125 MB (131608576 bytes)
GPU Name: Intel HD Graphics 530
Model Name(s): MacBookPro13,3
Camelia: Disabled, Freq: 1388 Hz, FreqMax: 1388 Hz
Mobile: 1, PipeCount: 3, PortCount: 3, FBMemoryCount: 3
[0] busId: 0x00, pipe: 8, type: 0x00000002, flags: 0x00000098 - LVDS
[1] busId: 0x05, pipe: 9, type: 0x00000400, flags: 0x00000187 - DP
[2] busId: 0x04, pipe: 10, type: 0x00000400, flags: 0x00000187 - DP
00000800 02000000 98000000
01050900 00040000 87010000
02040A00 00040000 87010000
ID: 191B0006, STOLEN: 38 MB, FBMEM: 0 bytes, VRAM: 1536 MB, Flags: 0x00131302
TOTAL STOLEN: 39 MB, TOTAL CURSOR: 512 KB, MAX STOLEN: 39 MB, MAX OVERALL: 39 MB (41422848 bytes)
GPU Name: Intel HD Graphics 530
Model Name(s):
Camelia: V3, Freq: 1388 Hz, FreqMax: 1388 Hz
Mobile: 1, PipeCount: 1, PortCount: 1, FBMemoryCount: 1
[0] busId: 0x00, pipe: 8, type: 0x00000002, flags: 0x00000498 - LVDS
00000800 02000000 98040000