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Black screen monitor only works after waking from sleep


t3500master
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Hi

 

Specs:

3 monitor setup (2x 1920x1080, 1x2560x1440).

AMD 7950 Sapphire (2x DVI, 1 HDMI, 1 Displayport).

OSX Yosemite, Chameleon bootloader

 

2 monitors plugged into dvi ports, 3rd one running on an active Displayport -> HDMI adapter. 

All 3 monitors work in windows. 

 

The 3rd monitor is recognized by OSX. It shows up in display preferences and I can move my mouse over it, but it is a black screen.

 

If I set the computer to sleep and bring it back, the 3rd monitor works, but I don't want to have to put my computer to sleep right after turning it on. 

 

I tried the FB-rotate trick, didn't work.

 

Is there anyone with a similar setup that has any insights into this?

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