You can get the power consumption infos from "powertop".
Also take a look at /proc/acpi/battery/BAT1/state
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[Acer Aspire 1810TZ] general high power consumption in Ubuntu
https://bugs.launchpad.net/bugs/471376
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Bugs, which is
With severall settings from this page:
http://ubuntuforums.org/showthread.php?t=1341325
[...]
# Change the ext3 commit times to 10 minutes. Reduces disk activity
# disable disk writes when reading
mount -o remount,commit=600,noatime,nodiratime /
mount -o remount,commit=600,noatime,nodir