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GIGABYTE ATI Radeon HD6850 & HD6870 - Dual Monitor Issues

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Joined
Jul 1, 2011
Messages
74
Motherboard
Gigabyte Z68x-UD5-B3
CPU
Core i7 2600k 3.4GHZ
Graphics
ATI Radeon 6870
Mac
  1. Mac Pro
Classic Mac
Mobile Phone
  1. iOS
I have three CustoMacs set up behind a IOGEAR 4-Port Dual View KVM. All three are fully up-to-date (10.7.4) and work fine except for the fact that none recognize the second monitor.

I am about to pull each one off the KVM and see if it works off of the direct connection, but I see a lot of posts about Dual Monitors not working out of the box. I've tried the various fixes found on the forum to no avail.

My question is this, there seem to be lots of possible fixes. Is there a definitive guide to test and rule out the fixes?

Details on my gear below.

Thanks,

Doug


http://www.amazon.com/gp/product/B004IF6I1S/ref=oh_details_o00_s00_i02
http://www.amazon.com/gp/product/B004F6GJAU/ref=oh_details_o00_s00_i03
http://www.amazon.com/gp/product/B0029U15GC/ref=wms_ohs_product
 
Joined
Jul 1, 2011
Messages
74
Motherboard
Gigabyte Z68x-UD5-B3
CPU
Core i7 2600k 3.4GHZ
Graphics
ATI Radeon 6870
Mac
  1. Mac Pro
Classic Mac
Mobile Phone
  1. iOS
A little more research indicates that the dual monitor issue might be native to 10.7.4. Anyone else find that?
 
Joined
May 8, 2012
Messages
102
Motherboard
X79-UP4
CPU
i7 4930k
Graphics
Radeon R9-290x
Mac
  1. MacBook Pro
Classic Mac
Mobile Phone
  1. iOS
Not sure about the Gigabyte version, but I have the Diamond HD6870 and I have 3 monitors attached to it and it works perfect. I didn't have to touch any kexts to make it work properly either and I'm on 10.7.4
 
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