Fan control Thecus N2100/Debian Lenny

[Al <vanilla.source@gmail.com>]

I'm running Debian lenny on a Thecus N2100.
All is fine, except for one issue, I cannot control the fan in any
manner.

It would be nice to shut it off at times, as my one hard drive seems
to run quite cool under normal use.

I followed the instructions on the Thecus N2100/Installing Debian page,
but no matter what I do, the fan runs at full speed.

/sys/class/i2c-adapter/i2c-0/0-002e/pwm1, (and pwm2) already had values
of zero before I made any changes.

So, echo 0 > /sys/class/i2c-adapter/i2c-0/0-002e/pwm2
    echo 0 > /sys/class/i2c-adapter/i2c-0/0-002e/pwm1
has no affect on fan operation.

Is something missing in a lenny install, or am I overlooking some
detail?
-- 
Al