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I had been using only Ubuntu in my laptop for nearly two years, and the battery life with Ubuntu 16.04 was pretty long. It would last for nearly 10-12 hours. But after upgrading to Ubuntu 18.04, it only lasts for about 3-4 hours (normal light use) and the percentage of the battery decreases with every passing minute. Is there any fix for it?

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    Do you have two graphics cards? I had the same problem, in 16.04 working good with Nvidia Optimus but it seems to have stopped working. I just disabled it in the BIOS and my battery and heat problems were resolved. – JorgeeFG Jul 29 '18 at 21:05
  • I have also witnessed a drastic drop after upgrading from 16.04 to 20.04 (I never switched to 18.04 though). I think 16.04 really was quite awesome in power management. – shivams Jul 29 '20 at 2:55
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First read this Ubuntu Help article about Power & battery

If not enought you may want to install TLP

TLP brings you the benefits of advanced power management for Linux without the need to understand every technical detail. TLP comes with a default configuration already optimized for battery life, so you may just install and forget it. Nevertheless TLP is highly customizable to fulfil your specific requirements.

Install TLP :

sudo apt install tlp tlp-rdw
sudo tlp start

Then customize suspend setting : System Settings -> Power -> Suspend & Power Button.

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    why was this downvoted? – chovy Nov 21 '18 at 17:02
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I had same problem, and I finally found a solution, (but it may not be your case).
When you log in there is an option button, where you can choose from Gnome classics, Ubuntu and Ubuntu on wayland. I have been using Ubuntu on Wayland (because of some functions), and with this option the battery lasted max. 3 hours. So I changed it to Ubuntu, and now it works perfectly. I also updated the Kernel.

Hope it will work for you.

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