I ran into the same problem with my T41 laptop, re-built the kernel and - surprise- it solved the problem. I put the new kernel up on my web site. If you have a chance to execute the appliance on a compliant processor, you can create a new image by including the kernel that I built:

First, add the following line to /etc/apt/sources.list:

deb http://kwasir.org/deb/maemo/ binary/

Then, execute:
apt-get install linux-headers-2.6.17.14-ubuntu1-custom
apt-get install linux-image-2.6.17.14-ubuntu1-custom


You may get a couple of warnings about missing symlinks but that should be alright. Let me know if you run into problems.
Cheers,
--Norbert