Most probably the effects that you get are a byproduct of bad power management, 
due to the BIOS.
Do a 

ubuntu-bug udev

and follow the instructions.
The result would be a bug report with technical information from your computer.

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https://bugs.launchpad.net/bugs/1048544

Title:
  LENOVO ThinkPad L512 (2597AB2) Fan speed freezes, and hotkeys stop
  working

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