Regarding the Mesa packages — can you be more specific? I have been trying to get my Radeon HD 7450 running and need the AMD firmware, but firmware-amd-graphics doesn’t seem to be available. Should I just copy the firmware files (in my case radeon/CAICOS_pfp.bin) from another system? (Not sure if they’re arch-specific).
Edit: Nevermind, just ran the following to grab the firmware:
git clone --depth 1 --filter=blob:none --sparse https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git
cd linux-firmware
git sparse-checkout set radeon
sudo cp -R radeon /lib/firmware