Package: firmware-amd-graphics Version: 20190717-2 Can you include firmware files for the AMD Navi10 card in to the firmware-amd-graphics package? https://people.freedesktop.org/~agd5f/radeon_ucode/navi10/
The Linux kernel 5.3 has support for the Navi10 card. The Oibaf ppa Mesa master bionic version works with Debian Sid so Mesa support is available too.