Display issue with 6600M using displayport

[yfyfyf]

hi everyone, I recently started to have issue with the display. I say recently because I haven't experienced this problem for months besides when I first got the machine running. It had somehow resolved itself and now it is like this again.

So the display would look normal for about 5 seconds, before becoming like this (see attached).
I can unplug and replug the cable and then it would be fine again... for about 5 seconds, then it would return to that state.

I can see that there are no issues with the HDMI output. This is only a problem with the displayport.

As for kexts I am using Lilu + WhateverGreen.

 

[Edhawk]

Assumptions:

1. You are running macOS Ventura on an AMD laptop containing the RX6600M or RX6600S dGPU.
2. You have disabled the AMD Integrated GPU in the bios.
3. You are running 2 x external displays from your laptop.
4. The HDMI connector works fine to your left hand display.
5. The DP out connector doesn't work, leaves you with the Blue & Green banding on the display.
6. You have checked that all cables are fully connected and are not bent, broken or in any way defective (visually).

Questions:

• Does your laptop have a DP out connector?
• Are you using Type-C out to DP for the righthand screen?
• You have tried using a different DisplayPort/Type-C cable?
• Have you tried using a different DP or Type-C port/connector (assuming your laptop has more than one)?