Weird EyeQ Output from Arria 10 Transceivers

From local Altera transceiver expert via email:

"The EyeQ feature uses an INI variable in 16.0 and later to enable it. Many customers want to use this to make quantitative measurements but its accuracy does not lend well to this. For this reason to cut down on support it was made into a by-request feature. We don’t guarantee its performance. We do guarantee the BER testing capabilities provided by the ADME blocks and PCS and PMA, all of which are in the main XCVR datapath used by your logic."

So it doesn't work as advertised but you can use it at your own risk (if you ask nicely).