Try to append iommu=soft or iommu=amd to the kernel parameters to see if it helps.

Here is the doc about appending kernel parameters.

    kyrios I'll try when I get home. Does the standard driver support this video card?

      Yes the standard open source drivers should support AMD GPU's out of the box

        kyrios iommu=amd worked. Solus has started, now how to check whether the video card is detected correctly?

            Justin kyrios I think he incorrectly defined the model. Maybe there is a way to fix it?
            inxi -G
            Graphics: Device-1: Advanced Micro Devices [AMD/ATI] Stoney [Radeon R2/R3/R4/R5 Graphics] driver: amdgpu v: kernel
            Device-2: AMD Topaz XT [Radeon R7 M260/M265 / M340/M360 / M440/M445] driver: amdgpu v: kernel

                Skaynet95 Err... I don't understand what you mean.

                You can just open a terminal and type to get info about your GPU's.

                linux-driver-management status