Keyboard and touchpad stop responding (F17, KDE, Samsung R60plus)

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http://forums.fedoraforum.org – I have a new (last Friday) install of Fedora 17 on a Samsung R60plus laptop. I'm using the KDE spin. Initially, the keyboard works fine (not sure about the function keys as I haven't checked all of them but mostly works, at least). The touchpad mostly works. I can't get it configured as I wish but it is possible that this is a hardware limitation. The touchpad buttons work. After I've been working for a while - how long seems to vary a bit - the keyboard, touchpad and buttons no longer work. Nothing I've tried elicits any response from the machine whatsoever. It is as if the keyboard, to (HowTos)