Comment 106 for bug 276990

"""The old driver from hardy uses a firmware microcode that is incompatible with kernels after 2.6.24. I tried installing it and it didn't work. Unless there are specific features you absolutely need from Intrepid you can continue to use Hardy as it is a LTS release."""
Alternatively you can just add the hardy main and restricted repos and install the hardy kernel on intrepid. This is what I did for about a month before there was any workaround for this at all.