High Sierra external screen lights up, but is completely messed up and glitchy

Question

cnsoft OP

Created Jun ’17

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The Kit , Mid-2014 15" MBP w/ 750M works 10.12 Sierra.

High Sierra not working. eGpu is detected and logout requested.

after logout , external screen lights up, but is completely messed up and glitchy.

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Answer 1

mikeyh OP

Jul ’17

Looks like our generation of MacBookPro11,3 (DG/750M) via Thunderbolt 2 do not currently work under High Sierra.

Mine is the late 2013 MacBookPro11,3 (DG/750M).

All displays works fine under Sierra with modified AMDRadeonX4200, AMD9520Controller, AMDSupport and IONDRVSupport kexts to enable IOPCITunnelCompatible.

Under Sierra I'm running the following...

NVIDIA GeForce GT 750M (NVIDIA Web Driver)

- Thunderbolt Display 2560 x 1440 (sadly there is currently no Thunderbolt display support for eGPU)

- Built-in Retina 2880 x 1800

AMD RX 580 (shows as AMD R9 ***)

- LED Cinema Display (1920 x 1200) via mini DisplayPort to full size DisplayPort adaptor

- old Dell 2407WFP (1920 x 1200) via DVI

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