Look on the FreeBSD wiki if the graphics chipset driver is available. If the graphics chipset is listed as it works on
https://wiki.freebsd.org/Graphics/AMD-GPU-Matrix, then the graphics should just work, whether or not the graphics is on the APU or on a graphics card. For a non-graphical or console desktops, the VESA driver is also expected to work well enough.
The Vega chipset is in the link, labeled as working. 11.2 is the minimum version.
AMD | Radeon Pro WX | Vega | Works | 11.2 | use "amdgpu" kernel module |
From a year ago, that list had less capabilities, it said 3d acceleration didn't work for many of them, and now the webpage doesn't mention that, so that is an implication that it has been fixed enough or improved.
Everyone says Ryzen CPU works. I don't have a Ryzen, but I have an AMD GPU, and my video driver off of it works. Perhaps more confirmation is needed for a specific chipset with a latest driver. It really should work. Nothing less than reporting a few bugs. APUs and graphics drivers have come a long way from a few months, and last year, up to two years ago.
I experimented with an AMD APU a few years ago when it wasn't known to work, then I used an additional video card for the available driver. I thought I could help report on if an APU would be treated the same by drivers then as a graphics card. The CPU part of the APU worked without a problem. A few settings, some counterintuitive in bios had to be set to get around limited graphics, and selecting output. I don't remember if the APU worked well with the VESA driver, I believe it did, but overall the VESA driver did work without the video card, and just the motherboard's capabilities. Whether the APU was working with VESA then, or the rest of the motherboard, didn't make a difference, in how slow VESA was for Radeon hardware. Now due to the improvements of graphics drivers, the graphics on the APU works on the same chipset RX Volcanic. The Turks ATI card was supported, otherwise, I needed VESA, back then.
The 5th column is the minimum FreeBSD version. This is a part of the list including all listed cards that need the amdgpu driver.
AMD | Radeon HD 7340 | Northern Islands / Wrestler | Works | 9.3, 10.0 | Post 11.2 can use "amdgpu" kernel module via drm-kmod port |
AMD | Radeon HD 7560D | Northern Islands / Cayman | Works | 9.3, 10.0 | Post 11.2 can use "amdgpu" kernel module via drm-kmod port |
AMD | Radeon HD 7660D | Northern Islands / Cayman | Works | 9.3, 10.0 | Post 11.2 can use "amdgpu" kernel module via drm-kmod port |
AMD | Radeon HD 7700 | Southern Islands / Cape Verde | Works | 11.2 | use "amdgpu" kernel module |
AMD | Radeon HD 7800 | Southern Islands / Pitcairn | Works | 11.2 | use "amdgpu" kernel module |
AMD | Radeon HD 7950 | Southern Islands / Tahiti | Works | 11.2 | use "amdgpu" kernel module |
AMD | Radeon HD 8000 | Sea Islands | Works | 11.2 | use "amdgpu" kernel module |
AMD | Radeon HD Rx 200 | Volcanic Islands | Works | 11.2 | use "amdgpu" kernel module |
AMD | Radeon Pro WX | Polaris | Works | 11.2 | use "amdgpu" kernel module |
AMD | Radeon Pro WX | Vega | Works | 11.2 | use "amdgpu" kernel module |