Hello tetsuo55
Can you please attach here, clicking on the below button 'Add attachment or 
patch', the file
/var/log/kern.log
from the affected system
Thanks
Fabio

** Changed in: linux (Ubuntu)
       Status: Incomplete => New

** Tags added: natty

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https://bugs.launchpad.net/bugs/722377

Title:
  [Firmware Bug]: Duplicate ACPI video bus devices for the same VGA
  controller. Switch display Fn button not working on Dell e6400

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