No audio on HDMI or Display Port on 980ti

Discussion in 'Mac Pro' started by Nesko, Dec 8, 2016.

  1. Nesko macrumors newbie

    Joined:
    Dec 8, 2016
    #1
    I own a Mac Pro 5.1 that I swapped out the original ATI HD5770 for a new Nvidia GTX 980ti so I could get 4K resolution on the TV is use as a monitor.

    running mac OSX 10.12.1, used the latest mac osx drivers, cuda driver 8.0.53 and quadro driver 367.1510.15f03 and get great video on both the HDMI and Display ports, but no sound.

    in the alt/ audio the monitor is no longer listed as a sound output source, and in the mac system/hardware/audio section there are no options or devices listed as HDMI or Display Port.

    so it appears the mac os does not recognize the 980ti's display port, or HDMI outputs as audio output devices, but those ports do show up as graphics card outputs. in system/hardware/graphics displays.

    very maddening problem I cant seem to find a solution for so any help you can offer would be greatly appreciated.

    I dont want to distract you form the main issue of getting the sound up on this card in my mac pro, but there is a really crazy thing i just discovered. I put the ati card that is not rated for 4k output, back into the Mac so I could get sound until i find a soluiton for the 980ti and that ati card is putting out 4k to my display using the nvidia drivers!!!! Am i crazy?
     
  2. ActionableMango macrumors 604

    ActionableMango

    Joined:
    Sep 21, 2010
    #2
  3. Nesko thread starter macrumors newbie

    Joined:
    Dec 8, 2016
    #3
    that work around was originally posted in 2012 and sounds like what i need, but when i click on the download link to get the HDMIAudio DMG file, it is a dead link and no file is available.

    Any idea if it still works or another place to get the DMG file.
    --- Post Merged, Dec 9, 2016 ---
    Ok here is the latest. I found an HDMIAudio 1.1 on Reddit and ran that file with no success at all.

    So still waiting for an answer or file that will work.

    Thanks for any info you can offer to help resolve this.
    --- Post Merged, Dec 9, 2016 ---
    another bit of info I did not enter in the original post. The 4k tv that I use as a monitor did show up as a speaker in the mac audio sound setting options, but when I installed the Nvidia the TV is not seen as a speaker option at all, and like I said in the original post in system/ hardware/ audio there are no Displayport or HDMI devices.
     
  4. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #4
    Did you keep SIP disabled?
     
  5. Nesko thread starter macrumors newbie

    Joined:
    Dec 8, 2016
    #5
    I did read about disabling the kext from SIP after I posted that response, and tried to do a cmd/R and a cmd/option/R boot into Recovery partition but my computer just does not respond to the command and goes right into a normal boot. So NO i was not able to change the SIP settings because I cant boot to recovery partition.

    I am searching for solutions to that at this point. any suggestions would be greatly appreciated.

    I suspect that the failure to change the SIP may also be limiting the functionality of the nvidia drivers for video as well since like the old ati card the new gtx will only run 4K at 30mhz as 60 or 120 are not available options in the display menu.

    thanks for your diligent efforts to help. I really appreciate it.
     
  6. ActionableMango macrumors 604

    ActionableMango

    Joined:
    Sep 21, 2010
    #6
    Do any keyboard commands work at startup? For example, if you hold down Option/Alt, do you get the boot selection screen?

    If not, you might want to try a different keyboard.
     
  7. pastrychef macrumors 601

    pastrychef

    Joined:
    Sep 15, 2006
    Location:
    New York City, NY
    #7
    The Nvidia web drivers are signed. Disabling SIP should not affect it.
     
  8. ActionableMango macrumors 604

    ActionableMango

    Joined:
    Sep 21, 2010
    #8
    I think he has to disable SIP to get the unsigned HDMIAudio.KEXT to load.
     

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