Po-Hsu Lin, as per 
http://www.dell.com/support/home/us/en/04/product-support/product/latitude-3340-laptop/drivers
 an update to your computer's buggy and outdated BIOS is available (A05). If 
you update to this following https://help.ubuntu.com/community/BIOSUpdate does 
it change anything?  If it doesn't, could you please both specify what 
happened, and provide the output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

Thank you for your understanding.

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

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https://bugs.launchpad.net/bugs/1412329

Title:
  [Dell Latitude 3340] When closing the lid, the screen won't be off
  unless it's locked

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