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[GUIDE] keeping iGPU activated when booting into Windows using apple_set_os.efi  

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(@juliangoespro)
New Member
Joined: 2 months ago
Posts: 2
February 16, 2019 8:56 pm  
Posted by: Notorious826

@goalque Hey guys — just following up on my last post.

I went back and ran DDU one more time to uninstall all the AMD, Nvidia, and Intel drivers. After that I rebooted into Windows with fixed_apple_set_os.efi on my USB Stick and it automatically detected the eGPU and installed the new AMD and Intel Drivers. Now everything is working flawlessly and the iGPU is running without any problems.

Full Setup
Laptop – Mid 2018 13" QC MBP with Touchbar (i7 Processor / 16gb Ram / 512gb SSD)
OS – High Sierra (Version 10.13.6) and Windows 10 (Version 1803)
USB Hub – Satechi Aluminum Type-C Multimedia Adapter 
eGPU – Razer Core X with AMD Sapphire Nitro+ RX580 8gb
Monitor – Apple Cinema Display connected via DisplayPort to Mini DisplayPort Adapter
External SSD – Samsung T5 512gb (For Bootcamp Games)

Was able to play Overwatch on Ultra settings with the RX580 and didn't experience any stuttering running the game off the External SSD. Now I am a very happy man 🙂

IMG 7132

Thanks a lot for all the information I found here! It took me quite some time to get my 13inc w/ TouchBar MacBook Pro to not only show the windows logo on the internal dispaly after booting with the Razor X / Radion RX480 driving my 144hz external display into Windows. 

The only problem is... it only works for one boot... then I have to reinstall the AMD driver... and since I am lazy I stopped using windows without the eGPU and just boot "normally" into Windows and the eGPU will work on the external display but with the MacBook showing the windows logo... 

I am just curious if someone has the same "I have to reinstall the drivers and reboot every time I want to use the internal dispaly as well as the external" problem... and maybe even fixed it 🙂

Thanks a lot!

EDIT: found this post and I think that might work... will try that <3 (again with DDU)

This post was modified 1 month ago

2018 13inc MacBook Pro with Touchbar + Razor Core X RX480


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abelviking
(@abelviking)
Eminent Member
Joined: 4 days ago
Posts: 28
March 22, 2019 11:02 pm  
Posted by: theitsage

Apple disabled the iGPU on all iMacs if they have a dGPU. apple_set_os.efi does not help.

Well, does this mean that using the internal display on an iMAC is IMPOSSIBLE on Windows? I can get my system to see both eGPU and dGPU in Device Manager. There's no data going into the iMAC's screen but the back LED lights are definitely on. 
Yes or No?
Thanks!

This post was modified 3 days ago

Sytem InfoiMAC Late 2015. dGPU AMD M390, OSX 10.12.6, Windows 17134.rs4_release.180410-1804(1803). GYGABYTE AORUS RX580 miniITX eGPU my signature


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abelviking
(@abelviking)
Eminent Member
Joined: 4 days ago
Posts: 28
March 22, 2019 11:52 pm  
Posted by: geaguirre80

I thought this method worked for iGPU models only. I tried with a 2016 macbook pro 15" dGPU AMD 450 without luck. Instead I'm booting Windows 10 with CLOVER and custom DSDT and works pretty well.

Can you please post your steps since I also get a screen with no posting because I'm lacking an active iGPU? iMAC's firmware disables the iGPU embedded on the Intel Chip. Talk about b.s.

Sytem InfoiMAC Late 2015. dGPU AMD M390, OSX 10.12.6, Windows 17134.rs4_release.180410-1804(1803). GYGABYTE AORUS RX580 miniITX eGPU my signature


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abelviking
(@abelviking)
Eminent Member
Joined: 4 days ago
Posts: 28
March 23, 2019 12:14 am  

Basic question here to make things consistent:
What do you see on Device Manager when the Firmware disables the iGPU: Is it Code 43? I am trying to find a lead as to why the Internal screen connected to the dGPU doesn't come up.  Pardon for multiple posts, thinking through it.

Sytem InfoiMAC Late 2015. dGPU AMD M390, OSX 10.12.6, Windows 17134.rs4_release.180410-1804(1803). GYGABYTE AORUS RX580 miniITX eGPU my signature


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