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I have relatively high discharge rate (about 14W, which results in ~3 hours of battery life) on my ThinkPad X230. I'm using TLP, intel_pstate's powersave governor. The following kernel arguments are in my /etc/default/grub:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_pstate=enable pcie_aspm=force acpi_osi=Linux acpi=force acpi_enforce_resources=lax i915.enable_rc6=1 i915.semaphores=1".

For comparison it lasts for 4-5 hours on Windows 10.

So, the question is: what else could I do to improve battery life?

UPD: Powertop report: http://pastebin.com/9hfBdKrm

nightuser
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2 Answers2

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SOME ANSWERS

YOUR LAPTOP IS 3 YEARS OLD OR LONGER

Replace the battery at some point.

Looking at your powertop stats Chrome is using your most battery and your cpu is really high,

SUGGESTION

Kill the background process and use something else for a browser.

Hope this helps.

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First of: powertop is reporting a discharge rate of 11.3 W. While this is not spectacular, it can not possibly be considered high. On a Lenovo T420 I had discharge rates in excess of 30 W.

The first problem you have is a degraded battery. As new, this 9 cell model boasts 94 Wh of storage, which at a discharge rate of 11 W should last in excess of 8 hours. If now it lasts just over 3 hours, the battery capacity is down to something above 30 Wh. Yes, Lithium batteries can degrade that fast.

Your second problem is a less than optimal power management on Lenovo models by the Linux kernel shipped with 14.04. I reported this as a bug for the T420. You can follow the instructions there to try the mainline kernel and see if it helps. However, a different Linux kernel will never restore back the 60 Wh your battery has already lost.

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Luís de Sousa
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