X and Fluxbox :: Screen saver/blanking with Xfbdev?

Hi
I'm having a problem with Xvesa where it continues to consume memory over time. Memory leak I think. After a few days it is sometimes up to 100MB. Everything else works fine. I can set the screen blanking/saver with xset or at start time with the -s option to Xvesa.

To eliminate the memory issue I am trying to use Xfbdev. I have it running fine but the screen blanking/saver never kicks in. It looks like the same options should work but nothing seems to change.

Is it my system or does blanking just not work for framebuffer driver?
Thanks

original here.