Brotherseamus

Q: Mac mini 2014 won't wake monitor via HDMI

Hello! I just purchased a brand new Mac mini (Late 2014), 2.6 GHz Intel Core i5 with Intel Iris 1536 MB, running Yosemite 10.10. It's connected to an Acer K242HL monitor via HDMI.

 

The monitor connection works correctly (I'm typing this on it now), until I attempt to wake the monitor from sleep. The Mac itself clearly wakes when I click the mouse (the white light stops blinking and stays solid), but the monitor does not respond. I have to power off/on the monitor to get it to wake up.

 

I have previously used the monitor with a MacBook Pro (via HDMI) in clamshell mode and had no problems with it waking up straight away, so I'm assuming the problem lies with the Mac mini.

 

Can anyone offer any advice about this? It's very annoying not being able to quickly wake up the display when I need to use the Mac.

 

Thanks!

Mac mini, OS X Yosemite (10.10)

Posted on Oct 25, 2014 3:35 AM

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Q: Mac mini 2014 won't wake monitor via HDMI

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  • by Sybil Ann Chick,

    Sybil Ann Chick Sybil Ann Chick Oct 8, 2015 7:26 AM in response to matt1888
    Level 2 (245 points)
    Oct 8, 2015 7:26 AM in response to matt1888

    That sounded like me with mine! Monitor was fine on waking up when I tried it out with my old late 2009 Mac Mini connnected by DVI. Might have to buy a thunderbolt/mini DP cable to replace HDMI (Acer monitor with a variety of connections) and see if that's any better!

  • by AustinBike,

    AustinBike AustinBike Oct 8, 2015 10:49 AM in response to Sybil Ann Chick
    Level 1 (4 points)
    Servers Enterprise
    Oct 8, 2015 10:49 AM in response to Sybil Ann Chick

    They eventually fixed this in Yosemite, only to break it again with El Capitan.

  • by Martman100,

    Martman100 Martman100 Oct 11, 2015 8:35 AM in response to AustinBike
    Level 1 (0 points)
    Oct 11, 2015 8:35 AM in response to AustinBike

    I agree! I have an HDMI tv connected and it was doing fine until I recently upgraded to El Capitan and now the problem has started again.

     

    APPLE PLEASE FIX THIS!

  • by er1c15,

    er1c15 er1c15 Oct 12, 2015 1:49 PM in response to Martman100
    Level 1 (20 points)
    Oct 12, 2015 1:49 PM in response to Martman100

    So this is a bit odd for an older post to spring back to life.

     

    I purchased my MM in January of this year. After a few days of consulting with other forumers, I decided to return it while I was still within my return period. After keeping a close eye on the forums, it seemed that people were reporting the issue to be resolved with the last update of Yosemite (at least after the update that occurred after January), so I headed to the Apple store to repurchase the MM. And voila, issue resolved.

     

    I recently updated my MM with El Capitan the day after its release, and as far as I can tell, there are no issues regarding the MM waking up my monitor via direct HDMI>HDMI connection. Even when the computer returns to sleep, without me entering the password, the computer will re-awaken after pressing on the keyboard or trackpad.

     

    This is just a guess here, but the issues some of you are (re)experiencing may be model specific. It might be helpful to post your specific models to see if there is a correlation between the two. I'm not at home at the moment, but I guess I have whatever model was available at the end of January/early February.

  • by Sybil Ann Chick,

    Sybil Ann Chick Sybil Ann Chick Oct 12, 2015 2:13 PM in response to er1c15
    Level 2 (245 points)
    Oct 12, 2015 2:13 PM in response to er1c15

    Mine is a new Mac Mini purchased online from Apple late September this year. It was waking the monitor quickly (Acer and also new, which I tried out on my old Mac Mini - late 2009 - before the new MM was delivered) while it was running Yosemite but I noticed it needed more persuading after installing El Capitan the following week. It does wake up OK but takes much more than the couple of seconds it took with Yosemite. Both my keyboard and mouse are wired (have tried a few mice!) and connection to monitor is HDMI.

     

    I don't have any problems when I boot up the MM and switch on the monitor, nor do I have any problem if I turn the monitor off while the computer is sleepng and then turn it on again when I wake it.

  • by iashton,

    iashton iashton Oct 13, 2015 12:19 AM in response to er1c15
    Level 1 (8 points)
    Mac OS X
    Oct 13, 2015 12:19 AM in response to er1c15

    Mac Mini November 2014. Just upgraded to  El Capitan 10.11

    Viewsonic VP2770-LED connected HDMI(mac) to HDMI(Monitor). Connected with an Amazon Basics HDMI cable

    Viewsonic input set to HDMI.

    Wireless Keyboard and trackpad. Both Apple.


    Mac wakes up from deep (LED off) or short(LED pulsing) sleeps to  LED solid - after keyboard press or trackpad click

    Viewsonic comes out of  power saving mode (LED turns from amber to blue)

     

    No problems after upgrade from Yosemite. However like Sybil Ann Chick it does take 2/3 seconds longer to spring into life

  • by Sybil Ann Chick,

    Sybil Ann Chick Sybil Ann Chick Oct 13, 2015 1:43 AM in response to iashton
    Level 2 (245 points)
    Oct 13, 2015 1:43 AM in response to iashton

    Mine is taking a bit longer than that, maybe only up to 10 seconds in total but it seems a LOT longer waiting for it to happen!

     

    Just put MM to sleep to go and do something else so I could time it. Monitor sensed this and went into powersave mode with amber light.

     

    Came back and tapped keyboard. MM woke up (solid light) and almost immediately the monitor light turned blue. Then I had to wait a further 6-7 seconds for the computer screen to be displayed whereas with Yosemite it was almost immediate.

     

    Looking on Console, there are numerous repeated messages regarding WindowServer, alternately for Display and GLCompositor with others between them, over the time it was taking for the monitor to display anything, which makes me think they've changed something in El Capitan from what it was in Yosemite.

  • by deepowl,

    deepowl deepowl Nov 3, 2015 2:01 PM in response to Brotherseamus
    Level 1 (0 points)
    Nov 3, 2015 2:01 PM in response to Brotherseamus

    hey i have this same problem! mac mini will not wake up my monitor but its not a consistent problem. sometimes it wakes up and sometimes i have to kick it awake. my old mac never did this, more of a nuisance than anything else. any easy solutions?

  • by Richard Groff2,

    Richard Groff2 Richard Groff2 Nov 28, 2015 7:11 AM in response to Brotherseamus
    Level 1 (19 points)
    Nov 28, 2015 7:11 AM in response to Brotherseamus

    Yup. Same problem here. Just bought a new Mac mini to replace one from 2010 (which is now being used in my home office). I got it primarily for its ability to AirPlay to my Apple TV. I'm using the same monitor I did with my old Mac mini (Acer H233H) and am having the very same problem when waking from sleep. I've tried every suggestion here and nothing works. My inelegant workaround is this:

     

    Press the spacebar to wake up the Mac mini.

    Monitor wakes up with "No Signal".

    Turn off the monitor.

    Turn on the monitor.

    Press Input on the front of the monitor. Sometimes this brings up the display; sometimes I need to cycle through the inputs until HDMI comes up again.

    Desktop appears.

     

    Wish we could bring Steve back from the dead. So many things have gone wrong at Apple since he left us.

  • by Irvin Lustig,

    Irvin Lustig Irvin Lustig Nov 28, 2015 8:56 PM in response to Richard Groff2
    Level 1 (10 points)
    Nov 28, 2015 8:56 PM in response to Richard Groff2

    I have the exact same setup as Richard Groff2.  New Mac Mini (Late 2014). El Capitan 10.11.  Same symptoms. I can log in by typing my password. If I power cycle the monitor (connected via HDMI), then I get the screen I'm expecting to see.

     

    I'll try to call Apple and see what they say.

  • by mmp1964,

    mmp1964 mmp1964 Nov 29, 2015 6:29 AM in response to Irvin Lustig
    Level 1 (8 points)
    Photos for Mac
    Nov 29, 2015 6:29 AM in response to Irvin Lustig

    I also have the same problem.  It is intermittent.  I thought I solved it by selecting the Bluetooth preference: "Allow Bluetooth devices to wake this computer" - but the problem still randomly occurs.  I've tried every solution I've stumbled across.

  • by Richard Groff2,

    Richard Groff2 Richard Groff2 Nov 29, 2015 8:40 AM in response to mmp1964
    Level 1 (19 points)
    Nov 29, 2015 8:40 AM in response to mmp1964

    This is apparently an unresolved bug. Maybe in the next update? The one sure-fire way to avoid this for me is to turn the monitor off when I leave the computer for a while. When I turn it back on manually everything's fine. A bit inconvenient, but it works.

  • by Irvin Lustig,

    Irvin Lustig Irvin Lustig Nov 29, 2015 6:53 PM in response to Irvin Lustig
    Level 1 (10 points)
    Nov 29, 2015 6:53 PM in response to Irvin Lustig

    I spoke with AppleCare today.  Spoke to a pretty knowledgeable guy who understood things like HDMI pin signals.  He says that the MacMini Late 2014 is using the HDMI 1.4a standard, and that the Acer H233H monitor that I have is probably using an old HDMI standard.  He says he found other people having problems with the Acer monitors when they are using Windows or Linux.  Two possible fixes are to turn off Energy Saver (not recommended), or just get an HDMI->DVI cable and that will fix the problem.

     

    My next test is to try hooking up a TV that I have with an HDMI connector to see if the same thing happens or not.

  • by mmp1964,

    mmp1964 mmp1964 Nov 29, 2015 7:07 PM in response to Irvin Lustig
    Level 1 (8 points)
    Photos for Mac
    Nov 29, 2015 7:07 PM in response to Irvin Lustig

    I have an H236HL but it is probably using the same old connector.  I did try an HDMI-DVI cable but had some weird color issues - but I'll try it again.  I did originally have it hooked up to a Samsung HDTV and had no problems.

  • by Sybil Ann Chick,

    Sybil Ann Chick Sybil Ann Chick Nov 30, 2015 12:37 AM in response to Irvin Lustig
    Level 2 (245 points)
    Nov 30, 2015 12:37 AM in response to Irvin Lustig

    Mine is a new Acer monitor, S277HK and it was behaving fine with my new MacMini Late 2014 before the El Capitan update. TBH I don't have too much of a problem with it - just that it takes ages for the display to come up once I've clicked the space bar to wake the monitor. However, I'll try the HDMI cable that came with the monitor in case that's more compatible with the standard than the one I bought (as info didn't mention I would be getting a cable with the monitor package).


    Apparently it has HDMI 2.0 rather than 1.4a!

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