Second display problem with 10.9.4

Have tried that work around as well, and already reported the problem.

Really strange that there is not already a fix when it is quite normal to work with multiple displays these days.

I have waited for the 10.9.4, luckily it could be fixed then, and now I thinking had to be fixed in the 10.9.5, but no.

homiebrotha, thanks for writing about your experience; it parallels mine. I'm using a 2008 MacPro.

The kext fix was working for me as well on 10.9.3 and 10.9.4, but left me unable to boot on 10.9.5. I didn't try safe mode – glad to know that works – and had to boot from a second system drive, update that one to 10.9.5, get the new kexts, reinstall them improperly in the original boot drive (by simply dragging) and then fix the permissions using DiskWarrior. Whew.

That got the original drive booting again, but of course, I still had just one screen working, so I was back where I started. Very frustrating.

That other fix (deleting window server pref file) did nothing for me, either. I've looked high and low, and I'm not seeing anyone with working fixes for this 10.9.5 problem. Doom, defeat, despair.

I've been using the kext solution since 10.9.3 and just like the last couple posts it's stopped working on 10.9.5 upgrade... I've reverted back to using only one screen, but this is an incredibly frustrating bug to be around for as long as it has. Bug report submitted but I'm not holding my breath.

Was going to upgrade to the new mac pro soon but with this kind of support I'm starting to reconsider...

It is kind of crazy that Apple is "neglecting" this, considering all the reports and all the people actually having great use of multiple displays. Even crazier considering that I am using only apple products - the old mac pro and old cinema displays. How can that even happen?

Yeah, I feel the pain. It seams like we're stuck waiting until Yosemite as 10.9.5 is likely the last upgrade on Mavericks. I read somewhere earlier on this thread that Yosemite solves the issue, but that may just be wishful thinking

Hi Quarkdoll and all others

I fully agree with you. What kind of crap response is that, "just try Yosemite Developer Preview, because we THINK this is fixed !!!"

Are these guys serious !?

I am running 10.9.5 on a Macbook Pro Retina 15 inch and it is all f... up after the Maverick upgrade

I have done all of the suggestions and do not get a second display to work after upgrading to 10.9.x

Tested it on multiple monitors, projectors, etc...

All the same behavior...

Screen turns black when I attached the monitor via VGA Minidisplay port adapter, comes back again once every 1 -2 minutes

Mouse start to act weird and moving slowly across the screen. No image on the second display or projector

And this behavior continues until I unplug the display adapter and everything returns normal.

Applied the Altoronto solution and all other suggestions in this thread, no luck !

Also playing around with SwitchResX, did not work for me..

Today, i will buy a HDMI->VGA adapter to see if this will fix my issues.

Keep you guys posted...

quarkdoll wrote:

I wish the altoronto solution worked for me, but now instead of it periodically sending a signal out the displayPort / thunderbolt, it no longer does ever.

I got a reply on my Apple bug saying 'we think this is fixed in the Yosemite Developer Preview, could you please try that.',

Got some substantiation available for that, or are we just taking your word for it?

Hankong,

I believe that's a different problem, not least because you are using (analog) VGA, whereas the problem that affects us all is (digital) DVI.
My problem occurs with a Apple certified Thunderbolt -> DVI adapter, and I've also tried a third-party Mini-Display port -> DVI cable and have the same issue.
I'm not saying that it can't be the cable, but I find it unlikely, since it has an Apple logo on it!

No luck either. What the f... is happening? This is supposed to be professional gear for professional users. I was about to buy a new monitor for my editing suite and a new card to run it. I am doing lots of editing and grading. But can I buy it? Will it work. I am tired of already looking at one display that does not show up.

I called Apple support in Norway today as I had high hopes for Yosemite to solve my problems, but it did not. I got a message that I should hold the line after telling about my problems. Waited for 15 minutes and then I hung up. Have not heard more from them either. This is confusing!!

I am currently running dvi from both my screens, dual of course. And as you know, one of them works.

I have the apple adapter from Dual dvi from my 30" to mini display port for use on my macbook pro. Do you think it would help to use an adapter from the mini displayport to displayport, and run one 30" on dvi as I am doing and one to the displaybort on my graphic card? Would that do any difference at all?

Instead of running both on dvi.

Did apple purposely code the updates of Mavericks to make non-apple cables malfunction? That would be grounds for a claim. iOS 7 upgrade bricked my iphone4s when I plugged it into my sound dock. Now I can't use my samsung 24inch monitor with my dvi cable since upgrading to mavericks. this is totally unacceptable.

This is utter horse crap. I just updated to 10.10.2 to see if it would bring my second monitor back running off NVIDIA GTX 680 aaaaaaaand NO. Still no joy at all. Both monitors made by APPLE and given that they are large display port monitors, I'm not sure how to even connect and use adapters to get it to behave again. This is seriously BS. What's up Apple????????

I too inherited this external monitor feature since upgrading. What a shame. From exploding batteries, faulty graphic cards (MacBookPro's) to this - 2nd Monitor issues. really?. My guess is you couldn't find a way to make extra money from us using a generic external monitor so why bother encouraging us to do it. Well, in my book 3 strikes your out. After 20 + years I have had it. I bought an Android phone and Samsung tablet because I can add memory @ a reasonable cost, replace my own battery is needed and I don't need ANY special cables. Did I mention combined they all cost less then the price of 1 iPhone 6? Oh, with the additional savings I'll be shopping for a PC. It REALLY is a sad sad outcome to a once great organization. Does corporate even read the replies Customer Service sends to us in response to our valid requests for assistance? Oh, BTW, my iPhone 5S is making a decent MP3 Player as long as I keep it plugged in and disconnected from iCloud because the battery is dying and I don't want Apple wiping my original music library clean like you did to so many others.