This was a very rocky road and maybe its just me, but I found next to no helpful information in getting the 780M graphics of the fairly new AMD 7940HS to work on FreeBSD. Here is a short list of the things I had to do to get this working:
Now the GPU should properly initialize on reboot. If you forget any of the firmware packages or get the wrong flavour, you will get a kernel panic during boot. Actually, output from these kernel panics showed me which firmware packages were needed. So if you are installing a slightly different APU and do get a kernel panic, pay close attention to the AMD driver messages, these are really helpful.
The "friendly name" of the Ryzen 9 7940HS platform is "Phoenix", in case that gets later added to the AMD GPU firmware flavours.
If anybody is interested, the PC in question is a Minisforum UM790 Pro (which I was almost ready to throw out of the windows before I got this to work, finally). This also required the realtek-re-kmod package for the 2.5 GBit Ethernet interface to work.
- Upgrade to FreeBSD 15-CURRENT, it looks like the drm-61-kmod package required to support this APU is not available for FreeBSD 14 or 13. This is a bummer, I do not usually like to run bleeding edge development branches
- Install drm-61-kmod from packages or port (I installed everything from ports)
- Add the required kld_list="amdgpu" to your rc.conf
- Now install the following firmware packages/ports:
- gpu-firmware-amd-kmod-dcn-3-1-4
- gpu-firmware-amd-kmod-gc-11-0-1
- gpu-firmware-amd-kmod-gc-11-0-4
- gpu-firmware-amd-kmod-psp-13-0-4
- gpu-firmware-amd-kmod-sdma-6-0-1
- gpu-firmware-amd-kmod-vcn-4-0-2
Now the GPU should properly initialize on reboot. If you forget any of the firmware packages or get the wrong flavour, you will get a kernel panic during boot. Actually, output from these kernel panics showed me which firmware packages were needed. So if you are installing a slightly different APU and do get a kernel panic, pay close attention to the AMD driver messages, these are really helpful.
The "friendly name" of the Ryzen 9 7940HS platform is "Phoenix", in case that gets later added to the AMD GPU firmware flavours.
If anybody is interested, the PC in question is a Minisforum UM790 Pro (which I was almost ready to throw out of the windows before I got this to work, finally). This also required the realtek-re-kmod package for the 2.5 GBit Ethernet interface to work.
