Re: HDMI-DVI converted output to DVI display not working with 177.*
The issue seems to be fixed in drivers version 185.19 beta!
I had the same problem with my HP8710w:
HDMI worked with driver version 173
HDMI did not work with 177.x or 180.x I got two devices (DFP-1 and DFP-2), neither of which sent any signal to the monitor.
I installed the latest beta driver (185.19) and now HDMI is working perfectly. This driver detects only one device (DFP-2) as version 173 did. I hope this works for you guys too.