On Sat, 5 Jul 2008 16:17:01 +0300 "Felipe Balbi" <felipebalbi@xxxxxxxxxxxxxxxxxxxxx> wrote: > Hello all, > > I bought two x61s for testing purposes. One of them is running > windows XP and the other one is running clean ubuntu 8.04 with kernel > 2.6.24-19. The problem is that on windows that battery lasts around > 3h30min and with linux 1h30min. > > 2 hours is a huge difference. Here's the scenario: > > . x61s with windows xp > wifi on but not connected to any network, bluetooth on, > display is in the less brighten state. > > . x61s with ubuntu 8.04 > all radios off (modules removed and hw switch off), Which wireless is this? Same for graphics > > Anyways, do we reach D2/D3 states anywhere ? I mean without > context save/restore we can't reach D3 and almost no D2 as well. these don't give you all that much nowadays > > Any comments ? > There's a few things you can do to help stuff along; make sure you're using AHCI. Also take a look at http://kerneltrap.org/mailarchive/linux-kernel/2008/5/8/1771024 because these patches save like 0.75W in our lab. To be honest, I'm surprised at your results; in our testing (with a different distro though) we don't see such a difference and Linux is doing rather well. -- If you want to reach me at my work email, use arjan@xxxxxxxxxxxxxxx For development, discussion and tips for power savings, visit http://www.lesswatts.org -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
