I recently ran into this problem as well. I use titan's enhanced kernel, and had recently updated it. Since that was one of the last changes I had made since I noticed my radio stopped working, i downgraded it.

In x-term:

apt-get install kernel-power-flasher=2.6.28-maemo42 kernel-power=2.6.28-maemo42 kernel-power-modules=2.6.28-maemo42

This fixed my problem, radio works fine again. Hope this helps.