i'm running ubuntu 11.10 and i'm interested in getting more life out of my battery,

I see a lot of people adding extra lines to their /etc/default/grub file after "quiet splash".

For instance one user suggested

change GRUB_CMDLINE_LINUX_DEFAULT to be:
GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash pcie_aspm=force acpi_osi=Linux i915.i915_enable_rc6=1″

This was for his Acer Aspire Timelinex AS4830tg-6450,

The hardware of the 4830TG differ only by the processor, his is the intel core i5-2430M 2.3Ghz while mine is the intel core i5-2410M 2.3Ghz

Are these changes model/hardware specific.

What changes should i make to get the same results (he noticed a big increase in battery life)

anything else i can do?

Thank you