Pablo180, as per http://www.dell.com/support/home/us/en/04/product-
support/product/xps-14-l421x/drivers an update to your computer's buggy
and outdated BIOS is available (A16). 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

For more on BIOS updates and linux, please see
https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette
.

Please note your current BIOS is already in the Bug Description, so
posting this on the old BIOS would not be helpful. As well, you don't
have to create a new bug report.

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** Tags added: bios-outdated-a16

** Changed in: xorg (Ubuntu)
   Importance: Undecided => Low

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

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https://bugs.launchpad.net/bugs/1324113

Title:
  Screen goes black or flashes with Dual Monitors when certain apps are
  opened.

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