try moving your pci devices around
I originally had the precise problem as the first poster and after tweaking things for a few hours, I tried unplugging my cards one by one.
I unplugged a device using IRQ 11 (if I remember correctly) and afterwards everything worked. To fix this issue, you can either hard set your IRQs or just trying moving stuff around.
Remember, I'm not sure it was IRQ 11, but I believe that's the one. My problem was definitely related to IRQ conflicts and this may be your problem as well.