I have two monitors connected to a video card on my Desktop PC which has multiple outputs including two DVI outputs and an HDMI output. I previously had two monitors attached with DVI cables. My new monitors don't have DVI ports, so I got an adapter from DVI to HDMI to use. I have one monitor plugged into the HDMI port and I've tried using the adapter in both DVI ports. In both cases, only one monitor will work at a time. Both monitors are detected, but only one shows output, and the other one will have no options to set for resolution (and displays a message stating it can't read any input and is going into power save mode).
I can change which display is working by choosing either "Show only on 1" or "Show only on 2" under the "Multiple Displays" settings. The other two available options, "Duplicate these displays" and "Extend these displays", seemingly do nothing, and revert back to my last choice of the "Show only" options. "Make this my Main Display" is greyed out if I select either monitor. I get the same results attempting to use Windows+P to change how they display.
I'm at a loss as to how to solve this. Previously, it just worked, with the two monitors detecting just fine from the two DVI ports.
This is a Radeon 6950 card and I'm using two Dell U2417H monitors.
My Radeon driver version shows up as 15.301.1901.0 in Device Manager, and a Radeon Software Verison of 16.2.1 in AMD Radeon Settings (I don't know why there are two different values).
71 Answer
If you ONLY plug in the DVI to HDMI adapter & monitor it works? I believe you confirmed that above, but want to be sure as some adapters are only one way. My experience with this adapter type is that HDMI OUT from PC goes to DVI monitor so unsure if it works in reverse. Google pictures for this video card seem to imply it has two tiny plugs (Mini-DP, meaning DisplayPort). If it does your monitors said they came with Mini-DP to DP adapter cable
