I have a Netbook (Samsung N210) running Ubuntu 10.04 Netbook Edition. Generally, I'm very happy with it. However, I'm not getting quite as much battery life out of it as I expected based on the manufacturer's claims (and from what I have read elsewhere) - perhaps 4-5 hours, even when doing simple text editing etc.
I tried installing the
laptop-mode-tools package, which seemed extremely disk spindown happy - the disk spun up and down a lot - maybe every 5 seconds. I know laptop disks are designed for frequent spindowns, but that made me nervous and I uninstalled it. The alternative seems to be the default package
pm-utils-powersave-policy, but that seems to almost never spin down.
Incidentally, I have the checkbox "Spin down hard disks when possible" checked in my Power Management Preferences, but I'm not clear what that affects or interacts with - it would be interesting to know.
So: what should I do? I'd like to eke out a bit more battery life, but the laptop-mode-tools settings seem extremely aggressive out-of-the-box. I know they can be tuned, but there seems to be a huge number of them - I'd prefer something more out-of-the-box and tested.