Q: Laptop Power management Howto

Ow Mun Heng ow.mun.heng at wdc.com
Thu Nov 20 03:47:56 UTC 2003


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

Does anyone has a solution or something like a solution which I can try
out??

Anything would be good.. I want to extend my battery life.. Dell D600 on a
4320Mah 6cell Batt with 14.1 SXGA screen

Cheers,                                                 .^.
Mun Heng, Ow                                            /V\
H/M Engineering                                       /(   )\
Western Digital M'sia                                  ^^-^^
DID : 03-7870 5168                          The Linux Advocate

        





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