strange behavior in power management

Asked by Gang Chen on 2011-10-04

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?

Question information

Language:
English Edit question
Status:
Answered
For:
Ubuntu gnome-power-manager Edit question
Assignee:
No assignee Edit question
Last query:
2011-10-04
Last reply:
2011-10-04

If you look in power options it may have an option to not spin down the drive.

You may also be able to run:
gksudo gedit /etc/default/acpi-support

add the line:
ENABLE_LAPTOP_MODE=true

Save the new file and reboot to test.

Source:
https://wiki.ubuntu.com/PowerManagement#How_to_get_disks_to_spin_down_and_idle_correctly_.28without_excessive_load_cycling.29

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