Comment 4 for bug 1512012

Okay, finding time to deal with this again.

Now I'm getting inconsistencies on the left-side port. Behaviour seems to vary according to previous history: Printing the test page first gave me the already-reported garbled output, switching off the printer and then switching it on again and retrying the printout gave me no activity on the printer and a hung print job.
So I suspect it's not the USB port that made the difference but previous history and dirty state somewhere.
What's the best way for get a full reset of all relevant state?

For reference, I'm attaching the cups error log, timestamps of my activities:
17:48:38 I started system-config-printer
17:49:38 I opened the Properties context menu entry on the printer
17:50:25 I let the Properties dialog print the test page (not the self-test page)
17:51:10 I confirmed the OK button on the "test page submitted" dialog box