Hi Christoph,
The power-management kicks in as expected however to wake the XO up again you actually have to press the power-button, hitting a key or moving the cursor doesn't wake it up (as it does on the XO-1).
I think this is fixed in the new OHM in os48 -- could you retest, please? (Fixed using the same dance I described, but done programmatically inside OHM. Yuck.)
Also power-management doesn't seem to be activated when closing the lid (at least the power-LED doesn't indicate that it is).
This one's only a problem with B2s.
Thanks,
- Chris.