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I sometimes have a problem shutting down elementary freya 0.3.2 (running on an early 2008 MacBook). After the system shuts down all devices (modem etc), the output is like this:

*will now halt

[7128.252276] hub 6-0:1.0 hub_port_status failed (err= -110)

[7128.252427] hub 6-0:1.0 hub_port_status failed (err= -110)

or

*will now halt

[4591.300273] hub 6-0:1.0 hub_port_status failed (err= -110)

[4591.300249] hub 6-0:1.0 hub_port_status failed (err= -110)

Then it just hangs and I have to turn off the machine using the power button. Any ideas? The problem occurs randomly and I don't know if the numbers in brackets are always the ones I mentioned here, they're just examples.