Ubuntu – Why does the computer get less battery life with Ubuntu compared to Windows

batterylaptoppower-managementwindows 7

Last year I purchased a Dell Inspiron 5315 laptop shipping with Windows 7 preinstalled. I installed Ubuntu 10.10 alongside it with dual-booting. On upgrading to Ubuntu 11.10, I was upset to find I now get less than one hour of battery life! Windows 7 gives me 2.5 hours of running time.

Is there any possible explanation why my battery is running out faster with Ubuntu? Can anybody tell me better power options?

Best Answer

There is a reasonably well known kernel issue with power management on PCI Express systems.

Try editing your boot-up grub entry to include pcie_aspm=force to the kernel parameters, and seeing if that improves your power consumption.

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