Bay trail DN2820FYKH is supported on Linux but does not work on FreeBSD. This behaviour is bug-compatible with Linux-3.13.5. References: http://d.hatena.ne.jp/syuu1228/20140326 http://lxr.linux.no/linux+v3.13.5/arch/x86/kernel/acpi/boot.c#L1094 Submitted by: syuu