strange behavior in power management
I installed Ubuntu 11.04 on Fujitsu Lifebook 3020 (Pentium-M 1.1G, 1G RAM, 250G HDD) and everything is working well except the power management when using battery power:
The hard drive keep spinning down after a short period. Then after less than a minute, it will spin up again for a few seconds, do some I/O activities, then spin down again. This cycle keeps going even after I disabled "spin down the hard drive when possible" in preferences through the battery icon.
If I run Ubuntu from the USB, the hard drive will spin down and stay down after about 15 min--which is really preferred for mobile use.
Why is the hard drive keep spinning down even if I told it not to? How can I adjust the time interval the hard drive should spin up/down? Is there a way to tell Ubuntu to keep as much in the RAM as possible unless it needs to save changes to the hard drive--behave as if running through USB except for the persistence?
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