Atom N270 - ACPI Error: [RTMP] Namespace lookup failure

[Ed VanderPloeg]

I'm using an Aaeon AEC-6831 embedded system based on an Intel Atom N270, 
which uses their GENE-9455 motherboard.  After updating the BIOS to 
enable ACPI, I'm now getting the following (verbose) console message 
during boot and every 10 seconds thereafter:

ACPI Error: [RTMP] Namespace lookup failure, AE_NOT_FOUND 
(20101013/psargs-464)
ACPI Error: Method parse/execution failed [\_TZ_.THRM._TMP] (Node 
0xc56b0760), AE_NOT_FOUND (20101013/psparse-633)
acpi_tz0: error fetching current temperature -- AE_NOT_FOUND

The unit seems to run very warm which makes me wonder if this problem is 
preventing lower power states, if such things are related.

I've collected the outputs from a verbose dmesg, from sysctl hw.acpi, 
and from acpidump.  They are zipped up over here:

http://www.agilecontrols.com/post/aec6831_acpi.zip

I've also included datasheets of the system and motherboard in case they 
are useful.

I ran the asl file through iasl and noticed 3 errors and 1 warning 
seemingly unrelated to this problem.  I fixed these problems good enough 
to get rid of the compiler messages and loaded the aml file for the next 
boot, but the behaviour didn't change.

The system is on my bench for development right now, so I'm able to poke 
around and try things.  For now I've simply reduced the ACPI messages to 
weekly with

# sysctl hw.acpi.thermal.polling_rate = 604800

By the way, what happens with a polling_rate of 0?  I tried this and the 
messages stopped, then changed it back to 10 seconds but the messages 
never came back again...

Ed VanderPloeg