Mid 2012 MP and LG-34um95 wake from sleep problem

Discussion in 'Mac Pro' started by kepgnar, Dec 30, 2015.

  1. kepgnar macrumors newbie

    kepgnar

    Joined:
    Dec 30, 2015
    #1
    You guys seem like experts, I can not figure out this problem for the life of me...

    I have a Mid 2012 Mac Pro with the ATI Radeon HD 5770 1024MB

    I recently purchased the LG 34UM95-P and have it connected via a Mini-DisplayPort to DisplayPort cable that is DP 1.2 compatible.

    Monitor works great, resolution is wonderful, however once the Mac goes to sleep, the monitor enters it's own standby mode, and then will not receive a signal from the Mac on wake. It will say "no signal detected" and go back into energy saving mode.

    For the first few weeks I had it, it would do the same initially, but after going back into energy saving mode, if I pressed the monitor power button, it would then receive the video signal and work normally. But now it will never get the signal.

    I have also tried going DVI-to-DisplayPort, same issue. This is not an issue when going from Mini DP to HDMI, however I only get 30Hz and this is unacceptable.

    It is impossible to find any examples online of someone with this same configuration and problem. I am fairly certain it has to with the Mac/video card, because my MBA and rMBP do not cause the same issue when using the same MiniDP to DP cable.

    Does anyone have any thoughts or advice on this? I've even begun looking at replacing the video card due to how annoying and nearly unusable this is. The monitor is about 6 weeks old at this point so I cannot return it.

    Anyway, any thoughts or advice that might get this working again is insanely appreciated. Thanks!
     
  2. ActionableMango macrumors 604

    ActionableMango

    Joined:
    Sep 21, 2010
    #2
    Many people have this problem. Did you try the usual fix of disabling Display Port 1.2 in the monitor's settings? If not, I'd try that first.
     
  3. kepgnar thread starter macrumors newbie

    kepgnar

    Joined:
    Dec 30, 2015
    #3
    i thought i had tried it both ways. but i just disabled it again, and will monitor for a bit (pun intended.)
     
  4. kepgnar thread starter macrumors newbie

    kepgnar

    Joined:
    Dec 30, 2015
    #4
    update: I have tried this with DisplayPort 1.2 both disabled AND enabled, the issue persists. Furthermore, I have the monitor's auto-standby option turned off.

    As it stands, the monitor only "works" (displays video from the Mac Pro) when first powering on the Mac Pro. If the machine goes to sleep at any time, I am unable to get the monitor to display video again, until powering off the Mac and powering it on again.

    What is the difference between waking from sleep and a fresh boot? Surely there's some way to get to the bottom of this.
     
  5. ActionableMango macrumors 604

    ActionableMango

    Joined:
    Sep 21, 2010
    #5
    The other problem I've seen is that certain Startech DP cables have the power wire incorrect, according to reviews on Amazon. But if you've used the cable on other computers and it wakes fine for those, the cable is probably fine.

    I see in the other thread someone narrowed it down to El Capitan, but I am doubtful of that because this LG has been spotty for waking from sleep on Macs before El Capitan was released.

    It's disappointing really because LG specifically advertised this monitor as a Mac compatible monitor, and clearly designed it for Apple users by including a Thunderbolt hub at a time when almost all computers with Thunderbolt were Macs, and by including OS X software.
     
  6. savoirfaire macrumors 6502

    savoirfaire

    Joined:
    Nov 23, 2003
    Location:
    New England
    #6
    I was encountering the same issue with my Mac Pro (with GTX 680) and 34UM95-P. Unplugging the DP cable and plugging it back in again would get the display to reconnect, but obviously that's not a satisfactory long-term solution. Installing the newest Nvidia drivers fixed the problem for me. Have you tried updating the ATI drivers?
     
  7. steveOooo macrumors 6502a

    Joined:
    Jun 30, 2008
    Location:
    UK
    #7
    I have the same issue.

    2010 mac pro with AMD R9 380 ( ) This is a PC bare card, HDMI does not work on it, so at least i know those with the stock ati 5770 have the same problem.

    Often the monitors screen will be black, when i press a key, i get the 'no input signal' i then have to wait for the monitors standby light to flash, then when i press the button, it comes on - about 15-20 seconds)

    for me its a bit annoying, can live with it but would be good to get a fix.

    Im going to uninstall the included software (LG Screen Split), maybe that had a thing to do with it.
     
  8. kepgnar thread starter macrumors newbie

    kepgnar

    Joined:
    Dec 30, 2015
    #8
    I have not discovered any fixes to this, but here is my current workflow:

    Real issue seems only to be actual waking from sleep. So...
    I have computer set to never sleep, and screen saver to start after a few minutes. I do have the machine scheduled to power off daily at 11pm.

    If I'm powering the machine on for the first time on a specific day, I press the power button on the Mac Pro, wait 5 seconds, then press the power button on the monitor. This works 98% of the time.

    To me this is a terrible workaround, but it does indeed work. I don't know if that helps anyone, but that's my current state with this monitor.
    --- Post Merged, Mar 21, 2016 ---

    I will look when I get home and see if there is a driver update for my card. I REALLY hope there is, and that it fixes the issue for good. I feel bad when my wife says "why doesn't it just work like the other computer (2011 iMac)?"
     
  9. jwpoof macrumors member

    Joined:
    Jan 11, 2006
    #9
    I deal with this problem a fair amount with my 2013 nmp and this monitor. Sometimes it won't wake up from sleep unless I do a hard restart, which, with four RAIDS running, is hardly ideal. The other issue I have is that, occasionally, my monitor won't come on even with a hard cpu restart. It stays in energy saving mode. I have found that hitting keys on the keyboard while also moving the mouse can wake the monitor, but this isn't a consistent solution. I too love the monitor but I won't buy another LG unless they fix this. I know it's possible that apple is responsible, but I have owned this monitor for nearly two years, through many OS X iterations, and it has never worked correctly. How LG could have ever shipped this monitor, advertised as being ideal for the mac pro, without discovering this obvious bug is utterly beyond me.
     
  10. steveOooo, Mar 24, 2016
    Last edited: Mar 24, 2016

    steveOooo macrumors 6502a

    Joined:
    Jun 30, 2008
    Location:
    UK
    #10
    At least i know it's happening with thunderbolt as well as Displayport (New and Cheesegrater MacPros)

    I find myself turning the monitor off at the back (when not using it for a long period, ie at night) - there's a big switch which is far better than the dainty little joystick on the front of the monitor - one physical button does everything - ooooo edgy design concept. NO how about a physical, reliable simple on / off switch you muppets!

    Today i woke my mac, THEN turned the physical on / off switch at the back and it came straight on - could be a solution or luck of the draw. The big switch at the back has a dimple on it - when this is pressed in, the monitor is on, so easy to feel if its in the on or off position. I've also found it fairly easy to find when sat down and sticking your arm around - sort of get used to the location.

    Just wish they'd put this on the front. The joystick is sometimes unreliable and slow and feels like it's lifespan could be in jeopardy if pressed all the time. I also find I leave the brightness as is vs changing it via the cumbersome joystick if i want to make it brighter etc...

    EDIT

    Turn monitor off on back
    when you come back, press a key on keyboard (i press command and tab a few times)
    THEN Turn monitor on

    Does seem it needs more time than normal to get a signal

    Slightly more tedious but overall quicker than waiting for the 'no signal screen'

    Just done this, could be a fluke but seems logical.
     
  11. soundslikebliss macrumors newbie

    soundslikebliss

    Joined:
    Jul 4, 2016
    #11
    Any updates to this? Or do I have to return the monitor ):
     
  12. ActionableMango macrumors 604

    ActionableMango

    Joined:
    Sep 21, 2010
    #12
    For what it's worth, I have the Dell UltraSharp U3415W which uses the same 21:9 IPS LCD panel as the LG 34UC97. But it does have different electronics and it works fine.

    I was looking into the LG, but all the complaints in the Massdrop forums scared me away.
     
  13. eskmo3 macrumors newbie

    Joined:
    Oct 3, 2008
  14. kepgnar thread starter macrumors newbie

    kepgnar

    Joined:
    Dec 30, 2015
    #14

    It definitely is an issue with OS X sleeping, and upon waking the machine, the signal is either not being sent by the Mac, or not being received by the monitor. (as a side note, none of these issues occur when booting to my Bootcamped Windows drive installed in the same machine.)

    My Mac however does not go to sleep unexpectedly, it sounds like you're saying yours does. My best workflow involves 2 things:

    1. when powering on the Mac:
    • I press the power button
    • wait 5 seconds
    • press the power button on the bottom of the monitor
    • Mac will POST a few seconds after that (2012 Mac Pro, takes about 10 seconds total to POST after pressing power button)
    • Press a key on keyboard repeatedly (keyboard runs directly to Mac, so really has no effect on the scenario, but makes me feel better)
    • 99% of the time, the monitor will get the signal and start displaying video about halfway through the boot up progress bar.
    2. when using the Mac:
    • I have the machine set to never sleep, and scheduled to power off every day at 11pm.
    • I also have screen saver set to automatically start after a few minutes, or with a hot corner activation.
    • 99% of the time the signal stays intact and there are no issues.

    I hope that helps somebody else. I really should just say **** it and get a different monitor, as it's truly an unnecessary pain in the ass.
     
  15. savoirfaire macrumors 6502

    savoirfaire

    Joined:
    Nov 23, 2003
    Location:
    New England
    #15
    I will say that using the web drivers helped, but I am having these brief episodes where the screen will go black for about a second or two then come back again. Happens maybe 2 or 3 times a night. Annoying. It's really too bad because the picture with this monitor is otherwise gorgeous. Haven't gotten to the point where I've said screw it and gotten a new monitor... yet.
     
  16. kepgnar thread starter macrumors newbie

    kepgnar

    Joined:
    Dec 30, 2015
    #16
    what web drivers are you speaking of specifically? can you link to them?
     
  17. savoirfaire macrumors 6502

    savoirfaire

    Joined:
    Nov 23, 2003
    Location:
    New England
    #17
    I just go through the preferences pane and use the up-to-date NVIDIA web driver
     

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