https://www.debian.org/doc/manuals/developers-reference/pkgs.html#marking-non-free-packages-as-auto-buildable https://buildd.debian.org/status/logs.php?pkg=firmware-nonfree&arch=all https://buildd.debian.org/status/package.php?p=firmware-nonfree
"Section: contrib/misc" at the latter URL looks very wrong, something likely needs updating on the buildd side for XS-Autobuild of packages whose override has been changed from non-free to non-free-firmware. cu Adrian
