Banding problem on light gray with RX 6600 XT

[brixx]

Hi,

I just upgraded from an RX580 to an MSI RX 6600 XT.

I have problems with some greenish banding on some light gray areas. Even the background of this website looks grainy with a slight shade of green barely but definitely visible.

I'll attach an icon where this is totally visible with stripes, and also I tried to take a screenshot of a light gray background where hopefully you can see the effect. But in the probable case I just see it on my screen with the "problem" I'm having I'll also attach a picture taken to the screen and to the gray patch zoomed way in (its gray-green pattern where it should be flat light gray).

If I put back my old 580 everything goes back to normal! Only with 6600 I get this problem

Ideas?

 

[Edhawk]

What are you using to activate the RX 6600 XT dGPU?
Do you have any DeviceProperties for the GPU, i.e. ATY Henbury?
Are you using the agdpmod=pikera boot argument?
Do you have the IGPU disabled in the bios?

Have you read and followed this guide for the RX 6600 XT regarding DeviceProperties etc.

RX 6600 XT: Henbury framebuffer and Zero RPM in Monterey 12.3

Note: this post is about a way to disable Zero RPM feature in a RX 6600 XT graphic card and and his relationship with the graphic issues seen in 5000 and 6000 AMD GPUs after updating to Monterey 12.3. Zero RPM By default, fans of the RX 6600 XT (like other AMD cards) are stopped below 60º...

www.tonymacx86.com

 

[brixx]

What are you using to activate the RX 6600 XT dGPU?
Do you have any DeviceProperties for the GPU, i.e. ATY Henbury?
Are you using the agdpmod=pikera boot argument?
Do you have the IGPU disabled in the bios?

Have you read and followed this guide for the RX 6600 XT regarding DeviceProperties etc.

RX 6600 XT: Henbury framebuffer and Zero RPM in Monterey 12.3

Note: this post is about a way to disable Zero RPM feature in a RX 6600 XT graphic card and and his relationship with the graphic issues seen in 5000 and 6000 AMD GPUs after updating to Monterey 12.3. Zero RPM By default, fans of the RX 6600 XT (like other AMD cards) are stopped below 60º...

www.tonymacx86.com

I have latest opencore and kexts (Whatevergreen included obviously), I'm not using any properties as it looks like it's not needed anymore and only affected fans and performance...

Yes I'm using pikera boot arg and I don't have an iGpu (KF cpu)

It's such a strange graphic glitch...

 

[Edhawk]

Maybe adding the DeviceProperties for the RX 6600 XT would help with these graphics issues.

Alternatively, you could remove WhateverGreen.kext and replace it with NootRX.kext and see if that makes any difference.

NootRX

Anyone tested this?. Some advice though when communicating with the developers. If you have a bug to report make sure you’re precise with your description. I reported a bug that wasn’t a bug, but the response was nice and I felt like I learnt something in the process, oh! Sonoma in zero...

www.tonymacx86.com

GitHub - ChefKissInc/NootRX: Lilu plug-in for RDNA 2 dGPUs. No commercial use.

Lilu plug-in for RDNA 2 dGPUs. No commercial use. Contribute to ChefKissInc/NootRX development by creating an account on GitHub.

github.com