Taihsiang Ho, as per http://www.dell.com/support/home/us/en/19/product-
support/product/inspiron-11-3147-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computer's buggy and outdated BIOS is available (A05).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

Once the BIOS is updated, and the information above is provided, then
please mark this report Status New.

Thank you for your understanding.

** Tags added: bios-outdated-a05

** Changed in: linux-lts-utopic (Ubuntu)
   Importance: Undecided => Low

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

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https://bugs.launchpad.net/bugs/1442487

Title:
  [Dell Inspiron 3147] blackscreen in some scenarios

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