Ubuntu – Ubuntu 20.04 LTS overheating after upgrading from Ubuntu 19

20.04nvidiaoverheating

I have just upgraded my machine from Ubuntu 19 to 20.04 LTS and it started overheating. Ubuntu 19 was working fine and the upgrade has not changed my configuration files (i.e. the turbo is still disabled and the cpu governor is still powersave). Also, tlp is installed.

The temperature I got upon running sudo tlp-stat -t was 52-58 °C on Ubuntu 19, while it is now 65-75 °C. The laptop gets especially hot when watching YouTube videos on firefox. When it gets hot, it starts lagging as well.

A bit of context:
Soon after I upgraded, I got rid of the nouveau drivers, with which there was serious lag, and I installed nvidia 440 drivers. I also tried nvidia 390, while I have not tried nvidia 435. nvidia 440 gives very good perfomance while nvidia 390 is very laggy. Also, I noticed that my touchpad doesn't work with 440 but it works with 390.
Finally, the kernel version on my machine is 5.4.0-29-generic.

Can anyone help me?

Best Answer

Under volting helps a lot when there is over heating (and by lot I mean A LOT). To be on a safer side, manufacturers supply higher voltage than required to the CPU (which causes heating), as at very lower voltages CPU doesn't work properly under stress. Under volting is completely safe. It will not void your warranty whatsoever. Under volting is basically removing the excess voltage supplied and giving the minimum voltage required to run the CPU smoothly.

Try intel-undervolt from here on GitHub.

Here is an article on CPU undervolting in Linux which I followed

Some terms in the guide might be deprecated. Refer to the first link for the deprecated terms.

Here is a step by step procedure with the non deprecated terms

  1. install git with sudo apt install git
  2. run git clone https://github.com/kitsunyan/intel-undervolt
  3. sudo su and then enter password
  4. run ./configure --enable-systemd --enable-openrc && make && make install
  5. close the root mode by typing exit and press enter
  6. run sudo systemctl daemon-reload
  7. run sudo gedit /etc/intel-undervolt.conf this will open a text editor
  8. change the value in line 10 (in front of CPU) to -130 like this undervolt 0 'CPU' -130 (recommended -125)
  9. now save that text file and exit
  10. run sudo intel-undervolt apply and then run sudo systemctl start intel-undervolt
  11. use the system for some time, if it looks stable then run sudo systemctl enable intel-undervolt.

As of selecting the offset, I use undervolt 0 'CPU' -130 in the /etc/intel-undervolt.conf file. As a beginner I would suggest you to stick to undervolting the CPU only.

To find the correct offset (unique to each CPU piece. Same CPU but on different computer could have different ideal offset) slowly lower the offset by small values (I used 10), and at the point where your PC crashes, is the threshold. And set the final value to threshold - 10. In my case it crashed at 140 so I set it to 130.

The only downside (if you don't choose sudo systemctl enable intel-undervolt) is that you will have to apply the settings on every boot. I have created an alias with alias us='sudo intel-undervolt apply && sudo tlp start'. So I just have to type us in the terminal on a boot, and then I am good to go.

Note: the crashing of PC to calculate the offset is completely safe. It will not damage you hardware whatsoever.

Note: Any Intel CPU can go to -125 at least, above that comes the difficult part. If you want to take it to the limit, then only try increasing it step by step. Otherwise -125 will work just fine for any Intel CPU.

You could also try to switch to intel integrated graphics card.

  1. sudo apt-get install nvidia-prime
  2. Reboot
  3. sudo prime-select intel
  4. Reboot

and we are done.

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