Gigabyte RX 560 - HDMI 2.0 Flickering

[danchristian12]

Hi all, recently got a RX 560 but my second display is flickering which is a 4K@60hz running over HDMI, but it keeps flickering off then going purple slightly and turning off for 1 second then back on wondering if anyone would know a fix for this?

The Flicker only occurs when using a HDMI 2,0 port on my Samsung U28E590D 4K monitor but when using the HDMI 1.4 port its abousltely fine no flickering using a Gigabyte RX 560 4GB this issue does resolve after using the Monitor after 1 hour but it randomly tries to do the same thing inbetween being back to 'normal' It's as if theres a connector issue but the monitors are fine on my Windows Hard drive.

Below are attachments

wondering if there is any insight to fix this? as it's making it unbearable to use on my 4K monitor opencore-2021-08-29-194005.txt https://share.icloud.com/photos/0XjqE7P-dRL-qwMl3nD9_-x9g https://share.icloud.com/photos/0XjqE7P-dRL-qwMl3nD9_-x9g

[Core-i99]

I know this works for IGPU but not sure about dgpu: try adding the "enable-hdmi20" to your gpu path inside the config plist. GPU path can be found with gfxutil

[danchristian12]

With what data entries guessing adding -Cdfon to boot args too?

[Core-i99]

What do you mean with the data entries?

You can use -cdfon boot arg or the enable-hdmi20 in the gpu device path

[danchristian12]

Tried both of these still no luck

[ghost]

I have two monitors. One of them supports 1080p 165hz and and the other 4k 60Hz. As information, the way iGPU works is not the same as how dGPU works. iGPUs mostly have a maximum 60Hz refresh rate while dGPUs support more than that amount. The way the iGPU works on monitors that support 4k 60Hz is very good as both support same refresh rate. For example UHD630 + 4k Monitor.

While dGPU is capable more than 60Hz. What will happen, the 60Hz 4k Monitor will be laggy if using a dGPU. As an example RX 6700 XT. This dGPU works well with Freesync only at 120Hz. I attach the picture below as an example.

Even i have RX 580 and RX 5500 XT not work well on 4k 60Hz. Resolution does not have any effect because most all platforms support all types of resolutions depending on the dGPU. A low refresh rate will cause problems for the dGPU for this reason. Easier if you have a 4k monitor that supports a refresh rate of at least 75hz to try. Even better if you have 4k monitor that supports 120hz to 165hz (If any).

Same principle when you have GDDR6 PCIe Gen 4 Video Card and use it on PCIe Gen 3 Slot. It still display but "bottleneck". Same function but different capability.

[danchristian12]

Ah okay so no real solution for this then?

[danchristian12]

My best bet might just be using the 1.4 and using it low resolution 1440p solution

[ghost]

@danchristian12 This problem can be sure as hardware issues. Yup, Lower Res is temporary fix for that. Permanent fix is to use 4k monitor which support above 60Hz for dGPU. IDK if someone other than me can explain other solution. In windows, you can overclock refresh rate from 60Hz to 75Hz. However, this will cause your monitor lifespan shorter. I don't recommend that.

Experiment Your hardware: You will experience 4k Youtube work great since it display using iGPU (QSV). Why it happen? Let me explain, 4k videos from Youtube support the same refresh rate as 60Hz which similar to your iGPU and 4k 60hz monitor. You can use Youtube "stats for nerds" to proove that. While, macOS UI laggy/flickering because the task is handled by dGPU. So it's a different hardware task. Youtube 4k 60Hz videowork best with your iGPU & 4k 60hz Monitor but not on dGPU.

[PMheart]

Hello! Please use forums for support.