Just last week AMD launched its latest Ryzen 3000 series of CPUs. The third-generation Ryzen chips are the first to be based on 7nm technology, but there is a problem for users of some Linux-based systems.
For distributions based on newer versions of the Linux kernel, an issue renders systems unable to boot. Some users have managed to patch the systemd component with an older version to allow successful booting, but a BIOS update from AMD is what's needed.
While the boot problem was noticed by many users, it was Michael Larabel writing for Phoronix that highlight the issue. In his review of the AMD Ryzen 7 3700X and Ryzen 9 3900X he said that the chips "offer incredible Linux performance but with a big caveat". He ran into problem with various Linux distros, as he explains: