"Why did my internal keyboard and mouse suddenly stopped working?"에 답변Mine seems to be having a similar problem. However, it comes and goes randomly whenever. I plug USB devices in. Each time I plug something in or unplug something, it seems like there's a chance for the keyboard and trackpad to become either enabled or disabled. My (annoying) solution, therefore, is to keep a USB mouse or something on hand, and just repeatedly plug/unplug it until I can type without it.