Comment 11 for bug 1378180

Vish, as well, as per http://www.dell.com/support/home/us/en/04/product-support/product/inspiron-3847-desktop/drivers an update to your 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.