7310 duplex printing from Linux

Greeting all.

After getting a few (of my) problems sorted out, I have been using our
7310 quite happily printing from both Linux and Windows.

The only thing I have not been able to get working is to have the printer
print double sided, as it can from Windows.  I'm sure it is probably
something simple I've missed, but I can't find it.  Any suggestions?

Thanks in advance.

- Mark



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