[BUG] On mid-2011 iMac only works in High Sierra with MXM GPU Model OCLP config about kryptonite HOT 4 CLOSED

Yesterday I noticed an unfortunate side-effect of this configuration I have for High Sierra, the "prefer eGPU" option does not show up in app infos. I was able to get the eGPU to work by using a dummy plug, making it the primary display and turning on mirroring. This is a very suboptimal configuration however and makes some things so slow as to be unusable.

Maybe because I used that OLCP config something considers my 570 a dGPU instead of an eGPU, any ideas?

from kryptonite.

I found a solution, setting GPUSelectionPolicy to preferRemovable either in the app's Info.plist or in the preferences with defaults write <bundle-id> makes my eGPU work.

For Steam games it has to be set in the preferences for both the app and the helper.

from kryptonite.

Support with OCLP is not guaranteed. In this case your Mac is too old and the workarounds needed to make your system boot newer OSes break egpu support.

from kryptonite.

Also wanted to say that I got a Vega64, and it works great as an eGPU with this method in High Sierra.

Do you know specifically what the problems might be that break eGPU support in OSes later than High Sierra on this mac?

from kryptonite.