Other things to try...
When the system "freezes":
1) Can you still toggle the caps-lock light by pressing the caps-lock key?
2) Can you reboot by holding down *all* of the following keys combos (do all of
them):
alt + sysrq + s
alt + sysrq + u
alt + sysrq + b
Also, would it be possible to try re-installing with a 13.10 / 14.04 image to
see if the behaviour is different?
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https://bugs.launchpad.net/bugs/1256949
Title:
Dell Latitude E5420 doesn't boot if killswitch is turned to "radio
off"
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