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I have installed Ubuntu 14.10 with Windows 8.1 dual boot.
I have noticed that Ubuntu gives 3hr and Windows 4hr battery timing.
Why?

Talha Junaid
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  • what version of ubuntu are you using, 14.04? – mchid Jan 09 '15 at 18:36
  • I am using 14.10 – Talha Junaid Jan 09 '15 at 21:31
  • Okay, I've made some changes to my answer to fit 14.10. Intel p-state is enabled by default in 14.10 so I've included instructions on how to disable p-state (instead of enable). Disabling p-state offers more options for frequency scaling when using indicator-cpufreq. There is a slight loss of overall efficency for certain settings and certain tasks. See the benchmark link for more info. – mchid Jan 09 '15 at 21:41

1 Answers1

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Windows has power management settings for your cpu set. You can install a cpu governor that will allow you to set the cpu to performance, or powersave:

sudo apt-get update

sudo apt-get install indicator-cpufreq

After installation, press ALT + F2 and type the command 

indicator-cpufreq

An icon will appear on your system panel. Click on this icon and make your selection.

There are a few power management tools available to help you control power consumption.

First, laptop-mode-tools:

sudo apt-get update

sudo apt-get install laptop-mode-tools

To use laptop-mode-tools, execute the following command:

gksu lmt-config-gui

Next, an alternative to laptop mode tools is TLP. If you do decide to install TLP, you must first remove laptop-mode-tools as they conflict.

Click here for more information on installing TLP.

Note: if you install TLP, I suggest using the hard drive setting "254" to minimize wear and tear to your hard drive. Also, if you want to use indicator-cpufreq, set the cpu "governor" to "performance". This eliminates scaling from TLP and allows scaling to be controlled by indicator-cpufreq. See here for more info.

here for more info on laptop-mode-tools

The following is for intel users only.

For more control over cpu freq. scaling, you can disable intel pstate. Disabling p-state will offer the options conservative, powersave, ondemand, and performance.

First, open a terminal and execute the following commands:

gksu gedit /etc/default/grub

Now, look for "GRUB_CMDLINE_LINUX_DEFAULT=" and make the line look like this:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_pstate=disable"

Save the file, exit gedit, and execute the following command:

sudo update-grub

Reboot for the changes to take effect.

click here for benchmarks and statistical use comparison between intel p-state and acpi cpu control including power consumption and performance

intel_pstate at kernel.org

Click here for more info on intel_pstate.

Install thermald:

sudo apt-get install thermald

Reboot for the changes to take effect.

click here for info on thermald

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mchid
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    I've managed to switch from cpu_freq to intel_pstate, and been pretty happy with the performance so far: On my system the CPU turbo modes seem to be handled in a more coherent manner than they were with cpu_freq and the power consumption is not notably different. – Charles Green Jan 12 '15 at 03:40