Solved Losing secondary display signal on full screen

[Juub]

Since yesterday it's been doing that. I recall tweaking some Power Options in the Control Panel in order to let my computer run for longer before going to sleep. I had also set up a screensaver I disabled after.

Now my problem is, if I set up a multiple display on my CP and have it as ''duplicate these displays'', everything seems fine. When I go in full screen mode in a game or anything else, the secondary display gets shut off. I think it may be related to a power saving feature but I'm not sure. I reset the settings to their default value but no luck.

Windows 7 64-bit SP1
Motherboard: Gigabyte GA-Z77MX-D3H F15(latest stable release)
Intel core i5-3550 3.3GHZ (boost 3.7GHZ)
PowerColor HD Radeon 7950 CrossfireX 925MHZ Boost(Latest stable drivers)
Corsair HX850 850W Silver Plus
8GB DDR3 Corsair 1600MHZ

Display 1: Asus VH242H 23'' 1080p
Display 2: Panasonic Viera 50'' 1080p

It used to work perfectly even with the CrossfireX set up. Also, if I stay on Windowed mode, it works.

 

[GARoss]

Hi Juub,

I'm not a gamer but do have dual monitors but on separate GPUs so I can't exactly step through what you are going experiencing. I did, however, do an online search & ran across something that might help.

"It used to work perfectly even with the CrossfireX set up. Also, if I stay on Windowed mode, it works." Post #2 found here mentions to "...Run your primary monitor games in a windowed mode," as you mentioned. He also seems to suggest that games want to run on the primary monitor (perhaps needing more graphic power?) & the second monitor "acts as an extended desktop", which seems to be your case.

You said it worked perfectly before, are you finding this on all games or perhaps a newer one?

 

[Juub]

Hi Juub,

I'm not a gamer but do have dual monitors but on separate GPUs so I can't exactly step through what you are going experiencing. I did, however, do an online search & ran across something that might help.

"It used to work perfectly even with the CrossfireX set up. Also, if I stay on Windowed mode, it works." Post #2 found here mentions to "...Run your primary monitor games in a windowed mode," as you mentioned. He also seems to suggest that games want to run on the primary monitor (perhaps needing more graphic power?) & the second monitor "acts as an extended desktop", which seems to be your case.

You said it worked perfectly before, are you finding this on all games or perhaps a newer one?

It does that on all games. Also, I've seen this thread before. I really think it's related to power management but I've already reset the settings to their default values.

 

[GARoss]

Really odd! Have you tried turning all power management off? Not back to defaults, but completely off.

 

[Juub]

I found out what it is. It seems CrossfireX doesn't support any DX9/10 game with duplicate display on full screen mode. If I play DX11 games, I don't lose the picture.

 

[GARoss]

Interesting. Glad you found the problem.