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I have an Asus K55VD laptop (Intel i7-3610QM, Intel HD-4000), and have noticed poor battery life when using Ubuntu: ~3hrs. This runtime is with the screen at minimum brightness, the processor scaled all the way down, pm-powersave set to "true", and the wifi power-management on. Does anyone here know how to decrease the power consumption? I've gotten the same battery life on 12.04, 12.10, and even raring pre-release. Are there some sort of Intel-specific power-management tools available?

Thanks!

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Try laptop-mode-tools. And also try these grub parameters: pcie_aspmi=force i915.i915_enable_rc6=1 i915.i915_enable_fbc=1 i915.lvds_downclock=1 drm.vbankoffdelay=1

This (and bumblebee, but this is not your case) worked very well for me.

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  • Good advice, my battery life jumped considerably just with laptop-mode-tools. However, when I applied the GRUB parameters you suggested and update-grubbed and rebooted, it knocked down the performance a lot, and no longer allowed 3D effects in Unity...
    – clappboard
    Mar 19, 2013 at 1:17
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no, you also must use bumblebee. i have the same your laptop, with bumblebee i have a 1 hours plus for battery time life

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