I've been experiencing this issue too (using an R9 280). At first, I thought it was random, but I found that I can reliably reproduce this by having Firefox open when the screen goes to sleep. As long as nothing is animating (including blinking cursors!), the card will switch to a low-power state once the screen goes dark; you can confirm this by opening up your case and making sure the fans have stopped. Then, if you move the mouse to wake up the monitor, nothing happens. This made it a lot easier for me to test various driver versions.
Like manilaboy1vic, I found that version 13.12 of the drivers works great. But, even better, version 14.11.2 beta also resolves the issue. This was only just released (on November 17), so it's pretty new, but I've been completely unable to reproduce the issue since installing it.
If anyone is still having this problem, I suggest installing version 14.11.2 of the drivers to see if they work for you. If not, hopefully my explanation of how I was able to reproduce the issue will help you to diagnose the problem on your end.
Ugh.. so i tried to set windows to turn off monitors after 10m and disabled the sleep mode and now the monitors are not switching off when i hit the win + l
Necroing this thread because I'm having this issue on my new 290x Lightning. I'm running the latest drivers, and I've tried wiping them and reinstalling twice now. I know it's not any of my other components since the 970s that this card is replacing ran perfectly fine.
bullshit, there are 3 TMDS streams.
the 7xxx only had 2 and required an active adapter for the 3rd.
however they may be implying you need to use a passive adapter on DP to access the 3rd.
That would be a pretty wierd design.
I am on my 4th RMAed Sapphire 290X all of the previous having the same issues. After hours of being on the phone with tech support the first time they told me it was a bad card and I should RMA. Just recently this 4th one started doing the same thing. Tired of spending money on sending these things back just to get another dud. Might just eat my losses and go with Nvidia from now on.
4 RMAs? Have you tried a fresh copy of windows and the latest drivers??