my laptop does not seem to support ASPM:

dmesg | grep ASP
[    0.963968] ACPI FADT declares the system doesn't support PCIe ASPM, so 
disable it
[    1.328171] ACPI _OSC control for PCIe not granted, disabling ASPM

but it looks like it supports epb:

dmesg | grep ENE
[    0.000241] ENERGY_PERF_BIAS: Set to 'normal', was 'performance'

so what could I do to reduce power consumption? with Linux battery lasts
less than 2 hours, in windows lasts almost 5 hours!

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https://bugs.launchpad.net/bugs/760131

Title:
  Power consumption raised significantly in natty

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