Giacecco
Level 1 (8 points)

Q: El Capitan unstable when connecting to external monitor using DisplayPort

I have a MacBook Pro Retina 15" mid-2015, 2.8 Ghz Intel Core i7, 16Gb RAM running MacOS 10.11. The external monitor is an Asus MX299Q.

 

Before El Capitan I did not have this issue.

 

When I connect the external monitor via Display Port - that is my preference - the photos below show what I see. The photos are from three different attempts. Apparently the same does not happen using HDMI. The issue happens:

- when I turn off the external monitor and turn it on again, and

- when I connect the external monitor after using the laptop's own display

 

I would like to quickly understand if it is a hardware or a software problem, so that at least I know where to go next. The way the issue started with El Capitan suggests the latter. Thanks.

 

Giacecco

 

IMG_2740.png

IMG_2741.png

IMG_2742.png

If I detach the external monitor and try to use the laptop's display, two times the display was ok but the system was unstable and I could slowly manage to close all applications and restart. Once, though, the problem was still there, as you see here, and I had to force turn-off and on again:

IMG_2743.png

MacBook Pro with Retina display, OS X El Capitan (10.11), 15-inch, mid-2015, 16Gb RAM

Posted on Oct 4, 2015 12:09 AM

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Giacecco

Q: El Capitan unstable when connecting to external monitor using DisplayPort

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  • by Eric Root,

    Eric Root Eric Root Jul 25, 2016 1:19 PM in response to Eli Sherer
    Level 9 (70,068 points)
    iTunes
    Jul 25, 2016 1:19 PM in response to Eli Sherer

    You might want to start your own post since this one is from last year. A new post would be much more visible. You can link to this one.

  • by Eli Sherer,

    Eli Sherer Eli Sherer Jul 25, 2016 1:54 PM in response to Eric Root
    Level 1 (39 points)
    Notebooks
    Jul 25, 2016 1:54 PM in response to Eric Root

    Thanks... I thought that is what I was doing...

  • by suchastrangenumb,

    suchastrangenumb suchastrangenumb Jul 28, 2016 2:34 PM in response to Giacecco
    Level 1 (4 points)
    Jul 28, 2016 2:34 PM in response to Giacecco

    I may have found a solution. On a whim I purchased this - https://www.amazon.com/Mini-DisplayPort-HDMI-Active-Adapter/dp/B01B702YTG?ie=UTF 8&m=A590JFSRVCU25

     

    Now, my display has a HDMI 2.0 input (that supports 4k) so I thought that maybe, it's simply a display port issue. So, from my Macbook Pro, I connected the above adapter (into Thunderbolt) connected an HDMI cable (capable of 4K) from the adapter to the display.

     

    No wake crashes. Still slow wakes, but I assume that's the display's fault because I can use the keyboard to login after wake before I see anything on the display.

     

    Crossing my fingers.

     

    I've let it sleep over night (hard disk shut down sleep) - I've turned my display off and on, running with screen savers.... so far so good. I've had this going for about 4 days now.

     

    Ill keep you all posted.

  • by willetling,

    willetling willetling Sep 7, 2016 8:30 PM in response to suchastrangenumb
    Level 1 (4 points)
    Mac OS X
    Sep 7, 2016 8:30 PM in response to suchastrangenumb

    Did buying the Active Adapter work?

     

    As of September 7, 2016, this is still happening to me with my 15" Macbook Pro and a Dell 4k 27" monitor. When connected via Display Port, it has all sorts of sleep/wake crashes, where the external display and the laptop display go black and I have to do a hard restart.

  • by marcremillard,

    marcremillard marcremillard Sep 8, 2016 7:29 PM in response to Giacecco
    Level 1 (4 points)
    Sep 8, 2016 7:29 PM in response to Giacecco

    Hi there, (September 8th, 2016)

     

    Tonight, I updated from Mavericks (10.9) to 10.11.6 because a software I bought needed to run on El Capitan.

    I have a MBP Retina 13inch late 2013 with Intel Iris 1536Mo.

     

    My macbook is plugged into my HDTV through the HDMI port of my MBP. I also use a self-powered USB hub for a USB mouse, keyboard and external soundcard. Never had any problems so far. In my second USB port, I have an external hard drive plugged in through USB3.

     

    After the update, I logged in to my user as I normally do. After less than a minute of opening the finder and google Chrome, my screen froze completely. Couldn't move the mouse or do anything. I had to perform a hard reset. After another boot, same thing happened, sometimes after a minute, sometimes after 30 seconds. I tried not opening Chrome to see if it had something to do with it, but no.  Sometimes, my MBP would auto reboot after freezing.

     

    The freezing did not happen in Safe mode, but when opening a browser, everything was going really weird, with some flashes and graphic glitches. Could still use it though.

     

    After reading this thread, I tried shutting down my computer, unplugging everything, and boot up without any external stuff plugged in. Bam! No more crashes.

     

    I understand that some people changed the cable or adaptors they were using to fix this issue, but it makes no sense to me as it was working perfectly 2 hours ago on my old OSX version.

     

    I will now one by one plug back my USBs and HDMI in and see if the freeze comes back. To be continued.

  • by marcremillard,

    marcremillard marcremillard Sep 8, 2016 7:48 PM in response to marcremillard
    Level 1 (4 points)
    Sep 8, 2016 7:48 PM in response to marcremillard

    Well, for now at least, it seems like the freezing problem is not coming back. Maybe I just had to unplug my HDMI and plug it back in to fix the issue. Will post if it ever happen again.

     

    What I did :

     

    1. Boot computer
    2. browse the internet and see if anything happens

    3. plugged my usb HUB in

    4. plugged my external hard drive in

    5. plugged my HDMI cable in.

     

    No crashes. maybe I was just lucky.

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