MrCabana Posted December 6, 2022 Share Posted December 6, 2022 Hello everyone, I recently bought a new MSI RX 6600 Mech 2x dGPU to replace my Intel's iGPU. Performed a clean install of Ventura which works fine, except for the dual Display now. This GPU has 4 output ports: 1) (right next to screw) DP -> to my main monitor using a DP=>HDMI connector 2) HDMI -> to my second monitor using HDMI cable 3) DP -> empty 4) DP -> empty Problem is that in BIOS, only the first monitor (DP) works. After that, OC starts to load Ventura and about 1/4 of the way, both monitors go blank and then only the second monitor (HDMI) emerges. If I re-plug the DP adapter, both monitors come to life. Curiously, the same thing happens on Windows. I don't want to mess with windows right now because I installed AMD drivers on top of previously used Intel's iGPU. Maybe it's just a driver issue that will be fixed when I have the chance to clean install Windows in a few weeks. Yes, I tried loading Windows through OC and also through its own UEFI entry in BIOS. Same result. Another curiosity, after messing with it, I managed to get both displays working on Ventura and Windows. Basically, I re-plugged DP in windows, changed both displays frame rates a few times and rebooted into Ventura. It survived several reboots. But then, I started dealing with USB port mapping. Changed a few things in my config.plist and added USBPort.kext and USBInjectAll.kext. Now my USB ports are perfect, but the dual display on boot is gone. I've tried several combinations, including using a DP=>DVI adapter, which gave me the two monitors working at BIOS, but same mono display on Ventura and Windows. Unfortunately, I don't have a monitor with DP input to try a straight cable without the DP=>HDMI adapter. I don't think it's a problem with the monitors, the cables, the adapter or even the GPU ports. All of them work fine if I re-plug DP. It seems to be some detection issue with the drivers. Right now I'm pulling my hair off with this. I bought this GPU because I heard it should work OOB with hackintoshes. I appreciate if anyone could shed some light into this. Thanks in advance. My specs: Mobo: Asus TUF Gaming-Plus with Wi-Fi Proc: Intel i3 10100 (with iGPU disabled in BIOS) Memory: 2x16 2666mhz DDR4 GPU: MSI RX 6600 Mech 2x   Quote Link to comment Share on other sites More sharing options...
Administrators MaLd0n Posted December 6, 2022 Administrators Share Posted December 6, 2022 check if csm is disabled on bios/uefi setup Quote -Donations- PayPal HERE - Stripe HERE - Ko-Fi HERE - BuyMeaCoffee HERE - Mercado Livre HERE Skrill danielnmaldonado@gmail.com - BTC 33HeGCuCSh4tUBqdYkQqKpSDa1E7WeAJQ3 - BNB 0x10D1d656eCa00bD521f9b4A43B83098B8142e115 - USDT BSC BEP20 0xb57cfdfa371fad1981910f0e8332409ab99f74d9 - USDT TRC20 TUR6Z9AVS4AYzqPnULoHrfFvppRbhXmNbZ - KASPA kaspa:qpxzufgfj8p6r0krg58yzvs0009h2mwqgvcawa0xc2pth7sgzpv56j4f6dtvk - PicPay @danielnmaldonado - PiX @danielnmaldonado@gmail.com Premium Users HERE - Problems with Paypal HERE Sign up for a Bybit account and claim exclusive rewards HERE New ways to earn money with Linkvertise HERE Link to comment Share on other sites More sharing options...
MrCabana Posted December 6, 2022 Author Share Posted December 6, 2022 Hello MaLd0n. Yes, it's disabled. Quote Link to comment Share on other sites More sharing options...
MrCabana Posted December 7, 2022 Author Share Posted December 7, 2022 I don't know if it helps, but I took IOReg screen shots before and after re-plugging the DP adapter. IOReg Screenshots.zip Quote Link to comment Share on other sites More sharing options...
MrCabana Posted December 7, 2022 Author Share Posted December 7, 2022 UPDATE: For anyone reading this ... apparently the problem is solved by replacing the HDMI cable that was connected to the adapter. I had 3 spare cables here and I had tried them all. Then I decided to borrow other 10+ cables from a friend. First attempt and BANG! It works. It's a thicker one, maybe supporting a later version of HDMI that made it work. Now I replaced the old cables with two new ones and it's all working flawlessly and, so far, this setup survived after 5 reboots. Quote Link to comment Share on other sites More sharing options...