1440p with HDMI to Displayport cable

Discussion in 'MacBook' started by willyx, Aug 31, 2016.

  1. willyx macrumors member

    Joined:
    Apr 25, 2014
    #1
    Hello all,

    I was wondering if it would be possible to output 1440p from the Macbook 12'' with the Apple HDMI hub and an HDMI to DisplayPort cable

    The reason is that my monitor (Dell U2711) can only display 1440p through the DisplayPort, not possible with the HDMI one.

    Thank you very much for your help!
     
  2. lympero macrumors 6502a

    lympero

    Joined:
    Sep 1, 2008
    Location:
    Arta, Greece
    #2
    Same problem for me also with a dell 2515 and I couldn't find a legitimate answer. However I think it's not possible to get 1440p 60hz with the new MacBook Pro on DisplayPort.
     
  3. Salty Pirate macrumors 6502

    Salty Pirate

    Joined:
    Oct 5, 2005
    Location:
    kansas city
    #3
    very frustrating that HDMI sucks and display port does not work. I have almost tried everything.

    The only thing that works reliably is HDMI out via the apple dongle, but with that, 1440p will only run at 50Hz, so some flicker. To run at 60Hz, the resolution goes down to 1080p. I believe the limitation is HDMI itself.
     
  4. mrex macrumors 68020

    mrex

    Joined:
    Jul 16, 2014
    Location:
    europe
    #4
    how well does your macbook 12" work with your monitor?

    im thinking to buy rmb, but i just saw this/your post. I have u2515h monitor which is also 2560x1440.

    Edit. Apple says that their own usb-c av dongle supports only 1080p/60Hz.

    This adapter allows you to mirror your MacBook display to your HDMI-enabled TV or display in up to 1080p at 60Hz or UHD (3840x2160) at 30Hz.
     
  5. Precursor macrumors 6502

    Precursor

    Joined:
    Sep 29, 2015
    Location:
    Istanbul
    #5
    I run 1440p on my U2715H @60Hz through apple dongle and hdmi cable without any problem (rMB)
     
  6. Salty Pirate macrumors 6502

    Salty Pirate

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  7. at0m macrumors newbie

    Joined:
    Sep 7, 2012
    #7
    I have the exact same monitor, I ended up using SwitchResX to create a custom resolution for it 2560x1440/60Hz* and it works fine. I connect through the Anker premium hub. I connect HDMI to HDMI on the U2711, on occasion when the monitor wakes up from sleep connected to the rMB it is just a blue screen ( think old VCR ), if that happens i just press esc to make it sleep again and press another key to make it wake up, it only ever happens the one time from waking up.

    * - Fairly certain 60Hz, I'm not at the computer right now.
     
  8. mrex macrumors 68020

    mrex

    Joined:
    Jul 16, 2014
    Location:
    europe
    #8
    or hdmi cable?
     
  9. mrex macrumors 68020

    mrex

    Joined:
    Jul 16, 2014
    Location:
    europe
    #9
    Odd, if specs say other... apple should fix the info then.
     
  10. Salty Pirate macrumors 6502

    Salty Pirate

    Joined:
    Oct 5, 2005
    Location:
    kansas city
    #10

    Went through 3 different cables, finally found the monitor specs. 1440p @ 50 Hrz
     
  11. Precursor macrumors 6502

    Precursor

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    Istanbul
  12. phillyboy82 macrumors regular

    phillyboy82

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    Oct 27, 2015
    Location:
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    #12
    This is not possible the way you are asking. HDMI to displayport requires an active converter which I think everyone overlooked and is not something that is seen that often. A passive HDMI to displayport cable will not work here, and those are normally meant to convert a Displayport++ (note the ++) video output to HDMI.

    The Apple converter is most likely converting Displayport to HDMI using the Displayport Alt-Mode per USB spec.

    However, if you can find a USB-C to Displayport cable then you will be good, as there are enough displayport alt mode "lanes" available to run 2560x1440 on a Macbook 12.
     
  13. Phil A. Moderator

    Phil A.

    Staff Member

    Joined:
    Apr 2, 2006
    Location:
    Shropshire, UK
    #13
    My daughter's 2015 rMB also works fine with a 1440p monitor (displaying 1440p @ 60hz) using the official Apple adapter and an Amazon Basics HDMI cable

    It's this monitor https://www.amazon.co.uk/Acer-G277HU-inch-screen-Monitor/dp/B00P67ZW9G
     
  14. phillyboy82 macrumors regular

    phillyboy82

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    Oct 27, 2015
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    #14
    OP wants to run 1440p using Displayport but wanted to go about it via the Apple adapter (to HDMI) and then from HDMI to displayport using a passive cable. Not going to work.
     
  15. tayy macrumors newbie

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    Sep 24, 2016
  16. willyx thread starter macrumors member

    Joined:
    Apr 25, 2014
    #16
    That's a great response that clarifies it.

    Too bad I won't be able to use such an expensive monitor with the Macbook at full resolution.

    Thank you and thanks all for your replies too!
     
  17. phillyboy82 macrumors regular

    phillyboy82

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    Oct 27, 2015
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    #17
    Happy to help. That dock mentioned in post #15 might be your best bet to get displayport while still allowing for USB port and charging access.
     
  18. apb87 macrumors member

    Joined:
    Apr 26, 2010
    #18
    I have the same issue with a Dell U3011, the older gen HDMI on those models doesn't support over 1080p. Still waiting for a decent priced USB-C --> DisplayPort, but all the current offerings and hubs have mixed reviews.
     

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