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I'm running an up to date NVIDIA version 8.1.790.0, on Windows 10, with an EVGA GTX 980 Ti driving two ASUS 4k monitors through DisplayPort.
All works well until the system goes to power save if I have left the monitors on - then I move the mouse or touch a key and the system wakes, but only with one monitor. In graphics properties, only one monitor is available.
I can then go back into NVIDIA control panel, Set up multiple displays and I get the option to check the box for the 2nd monitor, and when I hit Apply changes, the 2nd monitor is enabled, and as long as I move something onto that monitor it remains on until the next time the system sleeps - if I don't move a window onto that monitor it sleeps again after 30 seconds or so.
I have googled for solutions, and looked on the NVIDIA forums but had no joy.
I have also seen this question but the top answers refer to AMD or Quadro cards (with different functionality)
Is the second monitor branched on DisplayPort? – harrymc – 2016-01-14T20:27:44.820
I have 3 DP ports. I have each monitor plugged into one. Haven't bought a 3rd one yet... – Rory Alsop – 2016-01-14T20:28:46.077
In the question you quoted, my answer involved disabling EDID auto-detect for NVIDIA. See this article for details. Have you tried it?
– harrymc – 2016-01-14T21:24:39.350Sadly it isn't offered as an option on this card. – Rory Alsop – 2016-01-14T21:25:55.953
3 DP ports? According to the specs, GTX 980 Ti should have these three : HDMI, Dual Link DVI-I, DisplayPort. An application that it says set the EDID and so bypasses auto detection is Custom Resolution Utility - try it and see if you can set up a "Custom Resolution" that equals yours (I never used it).
– harrymc – 2016-01-15T09:21:38.107Could you please link to the DisplayPort cables your using? – Ryan Stott – 2016-01-15T21:48:29.657
harry - it actually has 4 DP ports and 1 DVI. No HDMI – Rory Alsop – 2016-01-15T21:55:11.267
Ryan - just the DisplayPort cables that came with the card. Blizlink is the manufacturer. – Rory Alsop – 2016-01-15T21:57:20.930
Have you tried Custom Resolution Utility? Another product you could try is PowerStrip (shareware) which forces the EDID on the Windows side (AFAIK it doesn't touch the monitor). See also this tutorial and Powerstrip Guide.
– harrymc – 2016-01-16T10:43:14.753harrymc - PowerStrip is discontinued, but I used Custom Resolution, and it has done the trick - if you add as an answer I'll accept and award you the bounty. Thanks! – Rory Alsop – 2016-01-17T17:08:24.713
Answer posted . – harrymc – 2016-01-17T18:52:18.703