https://bugs.freedesktop.org/show_bug.cgi?id=102800
--- Comment #12 from Alex Deucher alexdeucher@gmail.com --- Can you verify that the Linux pci subsystem is properly calling the ACPI _PR3 method on your platform? The workaround just uses the legacy AMD ACPI interface. It appears pci is not calling _PR3 properly for some reason on your platform.