I had a similar issue in my laptop. Installing the following solved my issue. Probably you'll also resolve your overheating. 2 things to solve your issue.

Note that while I didn't encounter any issues on my laptop running Ubuntu 14.04 with intel_pstate enabled and from what I've read, it works for others as well, it might not work properly for you so use it at your own risk and only enable it if you know how to disable it in case something goes wrong!

1. Enable Intel P-state:

1. Type in the terminal sudo gedit /etc/default/grub




2. Find the Line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" and modify
   it as GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_pstate=enable"




3. Save and exit gedit. Now type sudo update-grub in terminal and wait the grub to update




4. Reboot and test

To test:
Try running cpupower frequency-info and you'll get some output similar to

analyzing CPU 0:

  driver: intel_pstate

  CPUs which run at the same hardware frequency: 0

  CPUs which need to have their frequency coordinated by software: 0

  maximum transition latency: 0.97 ms.

  hardware limits: 1.20 GHz - 3.30 GHz

  available cpufreq governors: performance, powersave

  current policy: frequency should be within 1.20 GHz and 3.30 GHz.

                  The governor "performance" may decide which speed to use

                  within this range.

  boost state support:

    Supported: no

    Active: no

    25500 MHz max turbo 4 active cores

    25500 MHz max turbo 3 active cores

    25500 MHz max turbo 2 active cores

    25500 MHz max turbo 1 active cores

To change the profile of CPU running run this: sudo cpupower frequency-set -g powersave

Replace powersave with performance if you require more performance. (There is no performance issue for me. I am in power save mode)

2. Install Thermald

just run the command sudo apt-get install thermald

This will start automatically

Always google the stuffs before you install to know more about it

Hope this solves your issue. All the best.