X86 system management mode is not something you can turn off. It is there to protect motherboard firmware code that runs on the CPU. That code does things like

X86 system management mode is not something you can turn off. It is there to protect motherboard firmware code that runs on the CPU. That code does things like emulate PS/2 mouse and keyboard. See chapter 34 in [1]. SMM is not for enterprise sysadmins. They use other hardware and software for systems management. [1] http://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-software-developer-system-programming-manual-325384.pdf http://www.intel.com/content/dam/www/public/us/en/documents/...