netbsdnoob Start with the "hogs" first:
estd for CPU throttling;
xset dpms to power the screen off;
scsictl for the (spinning) HDD.
You could also try "suspending" unused devices (beware: may not work at all/could uncover kernel bugs...). Get a device list using
drvctl -l -t, then use
I used to use this script, but now I just compile a custom kernel:
$ cat ~/bin/disable-devices.sh
sudo wsmuxctl -f 0 -r wsmouse0
for d in pms0 ubt0 uvideo0 uts0
do drvctl -S $d
However, disabling stuff in BIOS is a much better option.