Issue with both gpus being on the same IOMMU groups and need help with what should fix it

[Hanzel]

If I read and understand the wiki & the aur page correct the procedure is:
Run arch
Install the aur package and follow the instructions
add option to bootloader
Succes

This probably won’t work on Manjaro

How do I ACS patch override (IOMMU) Manjaro

To make this work you have to build your own kernel.
https://jessequinn.info/blog/articles/acs-override

How do I ACS patch override (IOMMU) Manjaro

Check out this tutorial to:

[HowTo] Build your very first custom kernel

Difficulty: ★★★★☆ If you compile your own custom kernel, you’re basically creating your own distro, so before you post any support questions here on the forum, please revert back to the Manjaro kernel first! To start, grab the Linux kernel source. Go ahead and head to kernel.org, and choose the kernel you want to compile. I’ll use the mainline kernel as an example, which is 5.11-rc2 at the time of writing this post. You can grab it with git clone or wget the download link to it if…

Tagging the post with kernel might attract more knowledgeable users.