Re: ACPI + Laptop Power Management

[Ducrot Bruno <ducrot-kk6yZipjEM5g9hUCZPvPmw@public.gmane.org>]

On Fri, Nov 21, 2003 at 12:01:03PM +0800, Ow Mun Heng wrote:
> Hi,
> 
> 	This is a question (not a solution) to determine how to gain maximum
> batt life on a laptop.
> 
> More details on http://bellet.info/~bellet/laptop/t40.html
> 
> Currently, following the recommendations in the link above, I have set
> 'noatime' for my HDs as well as placing commit=600.
> 
> so in /etc/fstab
> 
> /dev/hda	/	etx3	defaults,noatime,commit=600 1 1
> 
> The commit=600 is supposed to stop Kjournal from committing to disk every 5
> seconds and to give a chance to the HD to spin down (not happening!) (can
> check via hdparm -C /dev/hda)
> 
> Doing a hdparm -y /dev/hda (to place the disk into standby) will only work
> for like 10-30 seconds before it spins up again. I have no idea what is
> causing it to spin up again.. (what I/O is going on??)
> 
> There is the option of changing bdflush as well, changing this (5th & 6th)
> to 6000 & 12000 does not yield anything better
> 

I'm using laptop-mode which is now in linux-2.4 since 2.4.23-pre7.
You should really look at.  Look at linux/Documentation/laptop-mode.txt
for more details.


-- 
Ducrot Bruno

--  Which is worse:  ignorance or apathy?
--  Don't know.  Don't care.


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