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With Fedora 17 I have a PS/2-connected keyboard. If I hold just the left CTRL key down for a period (say 5 seconds) then the whole keyboard locks up. The USB-connected mouse still works and I can navigate menus, etc. I can logout and then the keyboard works for login. While locked up I cannot use CTRL-ALT-2, etc., to switch to a different virtual terminal.

Anyone seen similar symptoms and/or have a clue as to the cause and/or a cure?

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What happens if you disconnect the keyboard and connect it back? If you can, test the keyboard in another machine, another PS/2 keyboard on that machine, and the keyboard with a different OS, to see whether the keyboard, the motherboard or the OS is at fault. –  Gilles Jan 15 '13 at 23:09
    
Disconnect/reconnect of keyboard no help. I do not run other other OSs (at least not on systems with a PS/2 interface). As noted, logout is sufficient to restore operation. I can try other fault-isolation techniques but I was interested to hear if any others have similar experiences. –  awy Jan 17 '13 at 6:57
    
Does this happen under X only, only in the console, both? Can you try with another keyboard (i.e., an USB one)? –  vonbrand Jan 29 '13 at 10:38
    
Only with X11. Not managed to try with a USB keyboard yet. –  awy Aug 9 '13 at 13:29
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