Fedora reexamines "trusted boot"

SMM is decades old, and BIOS vendors have been using it to patch faults in the CPU et al for almost all that time: it is nondisruptive and generally makes the system work better than it would before.

What's newer, starting in the laptop world perhaps in the mid-to-late 90s, is BIOS vendors using it to do other stuff (intercepting keyboard keys and enabling 'special features', for instance). *That* is disruptive and should be discouraged in the strongest possible terms.