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10.9.3 kills third monitor

The setup: 2 x 30" Cinema Displays connected via dual-port mini-DP to DVI adapters, connected to thunderbolt ports, and 50" TV connected to HDMI port, in new Mac Pro. All three monitors were working on 10.9.2, only one Cinema display and TV show up after update. Mac Pro has dual FireProD500 cards, 32 GB RAM, 12 cores.

Not sure if this is isolated to new Mac Pro's: older models with two mini-display ports and DVI to HDMI adapter may or may not still work.

Had to restore back to 10.9.2 to get all three monitors working again. Maybe they would work with mini-DP to DP cables? Not sure, have no way to test.

More users with same issue:


http://forums.creativecow.net/thread/344/30200

Mac Pro, OS X Mavericks (10.9.3)

Posted on May 16, 2014 12:26 AM

Reply
123 replies

Jun 3, 2014 10:43 AM in response to hkruse

I realize that you started this thread based on losing more monitors then 2. But, there are others that had 2 and after the update lost one of 2 and were left with one. I'm offering a solution to those people.



IF you think I should have some speceal thread just for those that lost 1 of 2 original monitors that's fine but the same update effected others with similar, though maybe not exactly, the same as the original post.

Jun 3, 2014 12:38 PM in response to Grant Bennet-Alder

Grant Bennet-Alder wrote:


If you are using modern monitors, check them carefully, looking for a Displayport jack. The black cylinder Mac pro will support up to 6 if you connect then with a simple Mini DisplayPort to DisplayPort cable.


If you look at my OP, display-port is not an option. Further, as you can see if you actually read through the 5 pages of postings above, 10.9.3 has broken support for multiple monitors. It doesn't seem to matter if it's DP or not. It's just broken.

Jun 3, 2014 12:56 PM in response to James Weisbin2

if you actually read through the 5 pages of postings above, 10.9.3 has broken support for multiple monitors. It doesn't seem to matter if it's DP or not. It's just broken.

I read previously and have now re-read all the items posted on this thread. In every case except ONE, the third and subsequent display, previously supported with an adapter to a "legacy" display format is what was broken by 10.9.3.


And lllaass reports that contrary to that ONE report of a second display conking out, their own setup is working fine with three, when two are native ThunderBolt or DisplayPort.


From this I infer (and so stated) that if you can get back to TWO on "legacy" adapters, that may perk up and start to work again under 10.9.3.


What seems to have broken, and badly, was the support for more than two "legacy" adapters that previously worked when some were ACTIVE adapters.

10.9.3 kills third monitor

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