Ubuntu – Persistent High-Fan Speed Ubuntu 14.04


I am using a Dell Inspiron 15R 5520 laptop running Ubuntu 14.04 with kernel version 3.13.0-34 generic. Since installing the OS, I have been having issues with my computer's fan spinning at its maximum speed for prolonged periods of time. I tried installing TLP, which works sometimes, and I also tried i8kutils but it only turned my fans off. This fan issue occurs more frequently when on AC power, and I cleared the exhaust of dust already.

Why is this happening?

I am not an advanced Linux user, but I am open to any suggestions you have at this point. Listening to a fan running at max is annoying.

Best Answer

Fan speed is normalized by editing the line


in the grub configuration file found at /etc/default/grub so that it reads

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=!Windows 2012"

Follow these steps to try this solution:

  1. Open a terminal, type sudo gedit /etc/default/grub, and press Enter
  2. Enter your login password and press Enter. The password will not be displayed as you type it.
  3. Edit the line


    such that it reads

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=!Windows 2012"
  4. Click "Save", wait a few moments for the file to save, then close the text editor.

  5. In the terminal, type sudo update-grub and hit Enter

  6. Finally, shut down your computer. Shut it down completely: don't restart it.

Once you turn your computer back on and select the linux operating system whose grub file you edited earlier, your fans should be working normally. This solution has worked for me on Ubuntu, Linux Mint, Elementary OS, and LXLE on a Dell Inspiron 15R 5520 laptop.