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 ahmojee,

    ahmojee ahmojee Jul 25, 2015 4:12 PM in response to iPhone236545
    Level 1 (4 points)
    Jul 25, 2015 4:12 PM in response to iPhone236545

    When I told the 4th Apple Care Senior Advisor about this forum she got pretty rude and gave me a lecture about how this could not be the same problem that everyone on here could be and that just because there was a lot of people on this forum having the problem that does not mean it is happening a lot.


    Same response I got from my 2nd phone consultant. The 3rd one was less dismissive, worked with me as I input the terminal code from another forum on the topic (next-to-last comment). Too soon to know if this code fixes the issue, since it has been intermittent. Case ID: 831224439

     

    There are 1

     

    The Apple salesperson who sold me Mini (former iMac user) convinced me to get HDMI cable, rather than DVI/HDMI adapter, as being quicker, more efficient. Yosemite 10.10.4; Samsung monitor

  • by TimQ,

    TimQ TimQ Jul 25, 2015 4:47 PM in response to ahmojee
    Level 1 (8 points)
    Mac OS X
    Jul 25, 2015 4:47 PM in response to ahmojee

    what would be nice would be for Apple to advise those who post their concerns on topics like this when a solution is implemented.

    Doubtful though, if policy requires denial of an fault, ever.

    Apple isn't beginning to act like the federal government, which is impenetrable.  It always has.

  • by ahmojee,

    ahmojee ahmojee Jul 28, 2015 8:57 PM in response to ahmojee
    Level 1 (4 points)
    Jul 28, 2015 8:57 PM in response to ahmojee

    Now I thought I'd be returning here to say the code inserted via terminal had solved my problem. But 4 days on and it's happened again. This time I didn't need to use the computer immediately, so I just walked away. When I came back a few hours later, it woke from touch of mouse. Oddly, one of my several open windows now doesn't respond in any tab, thought the other windows seem fine. related?

  • by jsh70670,

    jsh70670 jsh70670 Jul 28, 2015 11:05 PM in response to Brotherseamus
    Level 1 (0 points)
    Jul 28, 2015 11:05 PM in response to Brotherseamus

    I've been trouble shooting this wake display issue everyone has been having for a few months now. I have yet to resolve the problem, but I think I have narrowed it down to the GPU driver. When the tv/monitor is turned off OS X disables the GPU to conserve energy. The driver on the other hand remains loaded, idle, and waiting for the GPU to respond. The problem is that when the tv/monitor is off (usually for an extended period of time) the driver may timeout or stop responding. The only way to reload the driver in this case is to restart the mini.

     

    A simple solution to this FROM APPLE would be to simply allow the GPU to continue to run while the display is off. Remote Desktop runs like an Apple 2 with out the GPU anyway. After all what's the point in saving energy if you can't use the system.

     

    This is just me basically venting my frustrations about this completely avoidable issue with the simplest of solutions that Apple seems to not give a crap about since it is from what I can tell been an issue with OS X for quite some time now. As far back as 2012 at least.

  • by kisekileia,

    kisekileia kisekileia Aug 14, 2015 9:32 AM in response to Brotherseamus
    Level 1 (0 points)
    Aug 14, 2015 9:32 AM in response to Brotherseamus

    Update!  I was given a Mac Mini in early July this year, with a Samsung monitor, and I have had ongoing problems with the monitor not waking up from sleep, like everyone else in this thread.  Like a couple of recent posters, I have also had issues with the monitor not waking up after I turn the computer off and on again due to the problem.

     

    I spoke with Apple Support a few minutes ago and said "I know this is a known issue.  I have seven support forum threads and nine case numbers in front of me for this problem.  Can you please speak to your engineers and see if there is a fix for this?"  They admitted that it's a known issue and stated that engineers are working on the problem but there is no fix yet.  They recommended setting the computer to require a password to wake up from sleep, because if you enter your password, even though the screen will be black when you enter the password, the computer will wake up after the password entry.  I will see if this works.

     

    They stated that a fix will probably come up with the next OS X Yosemite update, which will likely be just before Apple releases new products in September.  So, this issue *should* be fixed by the end of September.  In the meantime, hopefully the password thing will work.

  • by TimQ,

    TimQ TimQ Aug 14, 2015 10:15 AM in response to Brotherseamus
    Level 1 (8 points)
    Mac OS X
    Aug 14, 2015 10:15 AM in response to Brotherseamus

    TThe Yosemite update this week didn't solve the problem.

  • by kisekileia,

    kisekileia kisekileia Aug 14, 2015 11:49 AM in response to TimQ
    Level 1 (0 points)
    Aug 14, 2015 11:49 AM in response to TimQ

    I know.  It's the next update that's supposed to fix it.

  • by ahmojee,

    ahmojee ahmojee Aug 16, 2015 11:23 PM in response to ahmojee
    Level 1 (4 points)
    Aug 16, 2015 11:23 PM in response to ahmojee

      I've found the last few times this has happened that if I turn the monitor off and then on, things work.

  • by Tuan Hai,

    Tuan Hai Tuan Hai Aug 25, 2015 7:46 PM in response to Brotherseamus
    Level 1 (0 points)
    Aug 25, 2015 7:46 PM in response to Brotherseamus

    I connected Display port to VGA on Samsung 22inch LED monitor and HDMI to Samsung 27 inch. Just only monitor via HDMI wakes up and sometimes the colour is disorderly.

    Mac Mini 2014 2.6

    Yosemite 10.10.5

  • by Tuan Hai,

    Tuan Hai Tuan Hai Aug 25, 2015 7:47 PM in response to Brotherseamus
    Level 1 (0 points)
    Aug 25, 2015 7:47 PM in response to Brotherseamus

    I connected Display port to VGA on Samsung 22inch LED monitor and HDMI to Samsung 27 inch. Just only monitor via HDMI wakes up and sometimes the colour is disorderly.

    Mac Mini 2014 2.6

    Yosemite 10.10.5

  • by Gmgq,

    Gmgq Gmgq Aug 30, 2015 11:29 AM in response to Tuan Hai
    Level 1 (0 points)
    Aug 30, 2015 11:29 AM in response to Tuan Hai

    Just wanted to chime in to say I'm having the same issue.

     

    Mid-2011 Mac Mini, 2.3GHz, 8GB RAM

    Yosemite 10.10.5

    HP w2207 LCD Monitor

    connected from Mac mini via [HDMI to DVI converter] to [DVI cable] to monitor

     

    I set the MM to turn off the monitor after X minutes, but the hard drives are set to never go to sleep.

    Monitor goes into sleep mode (amber LED), but when I try to wake it, it says there is no signal from either input. 

    I've tried tapping the MM power button, and pressing all the keyboard keys, as well as tapping and clicking my Magic Trackpad, etc.  nothing wakes the display.

    i Turn it off and on, but it fails to detect any input signals, so it goes back to sleep.

     

    MM is responsive, as I've used shortcuts that show its awake and still functional. I've also setup VNC on the MM and I am able to log in and  continue to use the MM, despite the display being asleep.  So I guess it's just a matter of the MM not being able to send a 'wake up' signal to the LCD? 

     

    SOMETIMES after some key and button smashing, the LCD WILL detect a signal and come back on, but I have been unable to recreate this miracle with any consistency.  Only sure way to get the LCD back on is with a hard reboot.

     

    I've  also done a P-RAM clear, no difference.

     

    i read someone got it working by using a HDMI to DVI cable (and eliminating the need for the converter).  So I'm going to try that next...

  • by Gmgq,

    Gmgq Gmgq Aug 30, 2015 3:42 PM in response to Gmgq
    Level 1 (0 points)
    Aug 30, 2015 3:42 PM in response to Gmgq

    Changing to a HDMI to DVI-D cable did not make a difference.  I even reset the PRAM. 

  • by cyvi937,

    cyvi937 cyvi937 Sep 4, 2015 12:11 PM in response to Gmgq
    Level 1 (100 points)
    Sep 4, 2015 12:11 PM in response to Gmgq

    The only thing I've found that works is swapping the Mini DisplayPort to HDMI cable I was using for a Mini DisplayPort to HDMI active adapter (connected to an ordinary HDMI cable). An active adapter keeps the signal "online" as far as the Mini is concerned and now my dual monitors wake without fail.

  • by Dwarddo,

    Dwarddo Dwarddo Oct 1, 2015 5:10 PM in response to cyvi937
    Level 1 (0 points)
    Oct 1, 2015 5:10 PM in response to cyvi937

    2014 Mac Mini i5

    2.8 GHz, 8GB,  Fusion

    Acer K272HUL 27" display @ 2560x1440 60hz

    Mini displayport to Displayport cable (no adapter)

    OSX 10.11 El Capitan

     

    Just so everybody knows, the El Capitan "update" did not fix this problem. My monitor still does not get a signal when powering ON my Mac. I still have to enter my login password "in the dark" and as soon as OSX starts loading my monitor finally comes on.

  • by ishrugged,

    ishrugged ishrugged Oct 3, 2015 5:11 AM in response to Dwarddo
    Level 1 (23 points)
    Oct 3, 2015 5:11 AM in response to Dwarddo

    @Dwarddo -- Bummer. I was hoping to (re)buy a mini this quarter.

     

    Will you please clarify your "enter my login password in the dark" statement?

     

    Do you mean you tap a key for mini wake-up, wait <x> seconds, then enter your password before the display awakes?

     

    Thanks in advance.

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