Laptop: Fujitsu-Siemens Amilo Pi-3525
OS: Vista

When my laptop is plugged in and I close the lid, it goes into S1 sleep. This means that there is still:

• fan noise (annoying when trying to sleep at night)
• lots of power consumed (so if I then unplug the laptop and toss it in the bag, by the time I'm at school it's already drained and beeping ominously).

What I want is S3 sleep, it solves both problems.

I've found a roundabout way to go into S3 sleep:

• Unplug laptop
• Close lid (or click Sleep in Start menu)
• Plug laptop back in if needed

The question: How do I force Windows to use always use S3 sleep when I close the lid?

One thing I've tried is: dumppo admin minsleep=s3 (dumppo from here)
Afterwards running just dumppo admin confirms that minsleep has been set, but closing the lid still goes into S1. Also, after a reboot, minsleep is reset to s1. I think dumppo is incompatible with Vista... MCE Standby Tool was recommended as a Vista-compatible alternative to dumppo, but it doesn't have any effect either.

I looked in the BIOS settings, but there are no settings relating to ACPI sleeps/suspends there.