PCI Pass Through IOMMU Groups Help

[TheCakeIsNaOH]

You are correct that the problem is that the GPU+GPU audio are in the same group as other things. You have a couple options for your type of situation-

1. Pass everything in the group through.(does not work for you)
2. Switch around cards in slots on the mobo(again does not work for you since all the slots are in one group)
3. Buy a better motherboard(last resort)
4. Update your UEFI(may work, who knows)
5. ACS patch as mentioned above

Here are instructions for applying the ACS patch on Ubuntu systems-

@TheCakeIsNaOH

With most distros, you have to download the kernel source code, insert the ACS patch, and compile+install the patched kernel.

Since you are running Ubuntu(or spin thereof), there are pre-compiled kernels with the acs patch available here-
https://queuecumber.gitlab.io/linux-acs-override/

Download the kernel and headers, and install them with sudo dpkg -i <file>.deb , obviously substituting the correct path. Put pcie_acs_override=downstream in /etc/default/grub in the line GRUB_CMDLINE_LINUX_DEFAULT=" ". Then run sudo update-grub and reboot.

Hopefully, then they will be separated.

If you want to learn to compile your own custom kernel, you can download the patch at the page above. Download the patch for the kernel version you will be compiling, the patch versions are very similar but with minor tweaks.