Nodes failed to transition out of "New" state on bulk commission

I tried to bulk commission about 25 IPMI controlled nodes that were all in the 'New' state in MAAS.

A couple of the nodes failed to transition to 'On' for some reason, and MAAS eventually timed out the power on request.

As a result, the nodes that did power on successfully never transitioned out of the 'New' state.

I have these errors in my log:

ERROR 2014-10-01 03:41:43,137 django.request Internal Server Error: /MAAS/nodes/
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", line 112, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/base.py", line 69, in view
    return self.dispatch(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/base.py", line 87, in dispatch
    return handler(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/maasserver/views/nodes.py", line 276, in post
    return super(NodeListView, self).post(request, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/django/views/generic/edit.py", line 171, in post
    return self.form_valid(form)
  File "/usr/lib/python2.7/dist-packages/maasserver/views/nodes.py", line 288, in form_valid
    stats = form.save()
  File "/usr/lib/python2.7/dist-packages/maasserver/forms.py", line 1910, in save
    return self.perform_action(action_name, system_ids)
  File "/usr/lib/python2.7/dist-packages/maasserver/forms.py", line 1858, in perform_action
    action_instance.execute(allow_redirect=False)
  File "/usr/lib/python2.7/dist-packages/maasserver/node_action.py", line 187, in execute
    self.node.start_commissioning(self.user)
  File "/usr/lib/python2.7/dist-packages/maasserver/models/node.py", line 943, in start_commissioning
    [self.system_id], user, user_data=commissioning_user_data)
  File "/usr/lib/python2.7/dist-packages/maasserver/models/node.py", line 451, in start_nodes
    wait_for_power_commands(deferreds)
  File "/usr/lib/python2.7/dist-packages/maasserver/models/node.py", line 137, in wait_for_power_commands
    results = block_until_commands_complete()
  File "/usr/lib/python2.7/dist-packages/provisioningserver/utils/twisted.py", line 108, in wrapper
    return func_in_reactor(*args, **kwargs).wait(timeout)
  File "/usr/lib/python2.7/dist-packages/crochet/_eventloop.py", line 217, in wait
    result = self._result(timeout)
  File "/usr/lib/python2.7/dist-packages/crochet/_eventloop.py", line 195, in _result
    raise TimeoutError()
TimeoutError

This is with 1.7.0~beta4+bzr3139-0ubuntu1~trusty1