The ACPI error on Raven Ridge/Windows 7 is now fixed on MSI motherboards.

[AnX]

I didn't expect fixes for Windows 7 to ever happen, but here we go. The Ryzen APUs, atleast on MSI motherboards, are now Windows 7 compatible. Unfortunately, the integrated graphics driver is not compatible, which kind of negates the whole point of these CPUs. Still, that means that this is merely a bug, and not a lockout, which makes me optimistic for future Ryzen CPUs.