laptop-mode disabled in kernel?

O. Sinclair o.sinclair at
Tue Jul 11 10:42:23 UTC 2006

you certainly gave me something to think about. Am planning to convert an XP
laptop to dualboot XP/Kubuntu with a mutual data-partition my
documents/home. And I had planned to do the data partition Ext3 and use an
EXT2IFS to get XP to read the partition instead of fiddling with having
Kubuntu mount NTFS rw correctly. And no, I do not want to make it FAT32
thank you.

But if that means that the laptops battery life gets seriously affected (and
it should if the disk never stops) then I have to think of another way. Is
there no way of disabling this and does the "laptop-mode" not correct this


On 11/07/06, James Gray <james at> wrote:
> Hash: SHA1
> marc wrote:
> > In Dapper, my laptop fan never turns off after the first few minutes. It
> > is always on. Whereas, in Windows, it rarely comes on. I'm pretty sure
> > that this is because the disk never spins down.
> - -->8-- Snipped --8<--
> > Back to the disk. There's only one active ext3 partition plus swap - all
> > other partitions are noauto. I've tried noatime and commit=600, but to
> > noavail. Any ideas?
> ext3 is the problem with your disk.  It uses a forced-flush interval of
> about 30 sec IIRC.  In other words, regardless of what is or isn't going
> on, the ext3 driver forces a sync and hence the hard drive never goes to
> sleep (neither would you if someone poked you in the ribs every 30
> seconds!).
> Solution, unfortunately, requires reformatting ALL the ext3 partitions
> with something else.  I'd suggest reiserfs as, like ext3, is a
> journaling file system and is quite mature.  I can't remember if jfs and
> xfs use the same "fixed sync interval" fru-fru like ext3 though, so I'll
> hold short of recommending them.
> HTH,
> James
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