Can anyone confirm complete system freezes with the new linux-firmware in the build repo on amdgpu systems?
Seems most of the new firmware was amdgpu related, which is these freezes here, fixed by downgrading linux-firmware.
Of no further response then it will be removed, and as always in these case, run:

sudo pacman -Suu

if you get a warning on update that local version is newer then in the repositoriies.