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Dual Monitor Setup Not Working


budest
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Hey guys,

 

Successful upgrade to HS bar a minor issue and that is that I can't have dual monitors running as I did with Sierra. I can only have one monitor connected at a time. If I connect the second monitor when the first is working fine the first monitor switches to display the second desktop and the second monitor just displays a black screen. When I disconnect the second monitor the first monitor reverts to displaying the main desktop. Hope that makes sense.


It's a weird one.

Prob should have noted that I am using a AMD Radeon 7 Series card with HDMI & DVI connections.  Worked flawlessly in previous versions of OSX

Any ideas?

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It seems I have encountered the same issue under macOS 17A365 with a Radeon R9 270x, although my desktop remains on its own screen and the secondary display draws pure black. It's a regression from macOS Sierra where the second monitor worked properly.

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