[GUIDE] General Framebuffer Patching Guide (HDMI Black Screen Problem)

[Qwinity]

Hey guys been tooling around with the framebuffer this weekend trying to get my UHD630 graphics to work correctly, let me give some context first:

Asus Prime Z490-P
Intel 10100 (UHD630)
Running OC 0.6.1
Catalina 10.15.7
Let me know if you need more info of what I am using.

So my current setup works perfectly with multi monitor (note using no adapters, have HDMI and DP on my mobo and using those directly), I had an issue before with 4k on one of my monitors but I resolved that changing my SMBios to 20,1 instead of 19,1.

My main issue is that I need to hot plug the HDMI monitor every time I restart the PC (on login), or I just turn it off and back on again, basically the same thing. I want to fix that issue, is there a way. I know it was mentioned on the first post but if anyone knows some context around that I'd like to figure this out.

 

[deeveedee]

Hey guys been tooling around with the framebuffer this weekend trying to get my UHD630 graphics to work correctly, let me give some context first:
...
My main issue is that I need to hot plug the HDMI monitor every time I restart the PC (on login), or I just turn it off and back on again, basically the same thing. I want to fix that issue, is there a way. I know it was mentioned on the first post but if anyone knows some context around that I'd like to figure this out.

Without seeing your debug files, it's a guess - you may need igfxonln=1. See these boot args. If that doesn't help, post your debug files (include sanitized config.plist).

 

[Qwinity]

Without seeing your debug files, it's a guess - you may need igfxonln=1. See these boot args. If that doesn't help, post your debug files (include sanitized config.plist).

Will try tonight thank you for helping me out with this. I will post the debug files if it doesn't work.

 

[Qwinity]

Without seeing your debug files, it's a guess - you may need igfxonln=1. See these boot args. If that doesn't help, post your debug files (include sanitized config.plist).

So I tried some more stuff today, couple of things I tried:
Added igfxonln=1
Made some changes to hybrinateMode (set to zero)
Made some changes to other sleep functions
was trying different busIds (sadly only busId 2 worked for HDMI all others didn't even output)
Logged everything (did some lilu+WEG debugging but nothing that was interesting in the output)
Changed some bios parameters (made some changes on vram, nothing)

So all that didn't work so here is my log file + config.plist + ACPI files

// Sanity Check

https://opencore.slowgeek.com/?file=cometlake0626R4ZSa&rs=cometlake062

 

[deeveedee]

So I tried some more stuff today, couple of things I tried:
Added igfxonln=1
Made some changes to hybrinateMode (set to zero)
Made some changes to other sleep functions
was trying different busIds (sadly only busId 2 worked for HDMI all others didn't even output)
Logged everything (did some lilu+WEG debugging but nothing that was interesting in the output)
Changed some bios parameters (made some changes on vram, nothing)

So all that didn't work so here is my log file + config.plist + ACPI files

I'm still using CLOVER (r5122) in my rig, so I'm probably not going to be much more help for you. My only other suggestions are:

1. Have you tried adding the CNConnectorAlwaysConnected flag to your framebuffer-conX-flags as @yrambler2001 describes here? (change flags from 0x03c7 to 0x03cf)
2. Did you try boot-arg igfxagdc=0 as described here?
3. Are you sure you need DeviceProperty framebuffer-unifiedmem
4. I experienced a similar "black screen" problem when I had my CLOVER config.plist GUI configured for a screen resolution that did not match my actual screen resolution. Does OC have an analogous GUI resolution setting?

 

[Qwinity]

I'm still using CLOVER (r5122) in my rig, so I'm probably not going to be much more help for you. My only other suggestions are:

1. Have you tried adding the CNConnectorAlwaysConnected flag to your framebuffer-conX-flags as @yrambler2001 describes here? (change flags from 0x03c7 to 0x03cf)
2. Did you try boot-arg igfxagdc=0 as described here?
3. Are you sure you need DeviceProperty framebuffer-unifiedmem
4. I experienced a similar "black screen" problem when I had my CLOVER config.plist GUI configured for a screen resolution that did not match my actual screen resolution. Does OC have an analogous GUI resolution setting?

Let's see:
1. Haven't tried that will do tonight and see that does a change
2. I didn't but in the post you gave me earlier, it said it was more for stability, but ill try as well cant hurt really.
3. not really, I added that flag as a try as well, increased my igpu mem from default 15xx to 2048 to see if that would make a change, but nope...
4. Not that I know of, I think opencore reads out at the beginning possible resolutions and picks the best one. In my case it grabs 1080 on both screens and they work perfectly until one of them turns off just at login and then I have to just hotplug it to make it work. It's as if it doesnt give the signal to wake up the hdmi port after it loses its signal.

Another funny thing is that if I leave it turned off the screen will come on in a couple of seconds but completly distorted (the other screen turns off) all I have to do is turn the monitor off and on and both screens will function. This tells me that a bad signal is being send to the hdmi port. I wonder if this is an OpenCore issue, wonder if it would work on Clover (although I dont think Clover supports 10xxx cpus yet correct me if i am wrong.

Worst case ill just have to buy a RX560 that is fully supported by mac.

 

[deeveedee]

Let's see:
2. I didn't but in the post you gave me earlier, it said it was more for stability, but ill try as well cant hurt really.

igfxagdc=0 boot-arg is required on my HackMini8,1 for multiple displays. Without it, I am only able to use a single display. The affect and required use varies by platform. It's equivalent to the AGDP disable patch mentioned by @shuhung here.

 

[killernos1]

Let's see:
1. Haven't tried that will do tonight and see that does a change
2. I didn't but in the post you gave me earlier, it said it was more for stability, but ill try as well cant hurt really.
3. not really, I added that flag as a try as well, increased my igpu mem from default 15xx to 2048 to see if that would make a change, but nope...
4. Not that I know of, I think opencore reads out at the beginning possible resolutions and picks the best one. In my case it grabs 1080 on both screens and they work perfectly until one of them turns off just at login and then I have to just hotplug it to make it work. It's as if it doesnt give the signal to wake up the hdmi port after it loses its signal.

Another funny thing is that if I leave it turned off the screen will come on in a couple of seconds but completly distorted (the other screen turns off) all I have to do is turn the monitor off and on and both screens will function. This tells me that a bad signal is being send to the hdmi port. I wonder if this is an OpenCore issue, wonder if it would work on Clover (although I dont think Clover supports 10xxx cpus yet correct me if i am wrong.

Worst case ill just have to buy a RX560 that is fully supported by mac.

i am right here with you for the life of me i cannot get the UHD 630 to work without turning my monitors on and back off, hopefully this will get fixed soon.

 

[Qwinity]

i am right here with you for the life of me i cannot get the UHD 630 to work without turning my monitors on and back off, hopefully this will get fixed soon.

I was weak, i am sorry and bought a RX580 powercolor, just works out of the box... both monitors go right on at startup, hopefully the uhd630 issue gets fixed one day in WEG.... ughh

 

[collider]

I'm on ASRock Z370M-ITX/ac + i5-8400. The DP port works out of box. I have used moe than one year. Recently, want to add another monitor using HDMI but none of the HDMI (the motherboard has DP+HDMI+HDMI) works. Followed this guide to fix the framebuffer, tried all the combination of the BusID. But none of them lit the HDMI monitor and none of the HDMI port in hackintool shows red (the DP monitor is always connected and red in hackintool). I have the experience to use hackintool to fix the USB limitation and enable Bluetooth. So should have no problem using the software. Is there anything I can do to enable HDMI?