I don't know if it's same on the Nvidia side. But on my 7950s, I found that EFI do affect the HDMI audio. It may be not 100% true, but the HDMI audio works fine when I boot them with the Mac EFI, and the HDMI audio may not work when I boot them with the PC VBIOS (the option still there, but just no sound when I select it).
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GUIDE: HDMI Audio
- Thread starter andrejkw
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I haven't tried it in a while but when I boot my Hackintosh with a GT 610 the HDMI option shows up but no sound is sent to the TV/Monitor.
Update: yea still not working using the stock drivers
Update: yea still not working using the stock drivers
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Well no love for me 
I've uninstalled and reinstalled several times, both with the 1.0 and 1.1 versions of the kext. Reboots, displays plugged, unplugged, receiver and tv on, no combo seems to work. HDMI never appears as an output source. Oh well. Sad that Windows has become more useful to me these days.
Thanks for everyone chiming in to help!
I've uninstalled and reinstalled several times, both with the 1.0 and 1.1 versions of the kext. Reboots, displays plugged, unplugged, receiver and tv on, no combo seems to work. HDMI never appears as an output source. Oh well. Sad that Windows has become more useful to me these days.
Thanks for everyone chiming in to help!
I've hit a brick wall too: El Capitan 10.11.2 on an Xserve2,1 with an Nvidia GT 520. I've tried every possible combination of HDMIAudio 1.0 and 1.1 with OS X's built-in drivers and Nvidia's latest Web Drivers (346.03.04f02). The strange thing is the audio device is visible in the PCI summary with "Driver installed: Yes", but there's nothing listed in the Audio summary, and there are no options in the Output tab of the Sound pref pane. I'll concede the Xserve is a special case as it doesn't normally have any audio output capabilities, but it shouldn't behave that differently from a MacPro3,1. It feels like I'm very close...
Out of curiosity, has anyone else successfully achieved HDMI audio on a Maxwell based NVIDIA Card (900 series) in a cMP?
The .dmg download does not work here - http://www.blanca.com/HDMI/
i get a cannot display page - anyone got the .dmg they can wetransfer or something?
Need audio on a AMD R9 380 sapphire nitro
i get a cannot display page - anyone got the .dmg they can wetransfer or something?
Need audio on a AMD R9 380 sapphire nitro
Mac Pro 1,1 10.10.5 GTX 960 HDMI, no chime, no audio outputs...I had audio through DVI and 7300 GT running 10.7.5 but not since this upgrade, I am getting an error under PCI: There was an error while gathering PCI device information? would external USB speakers solve this? I also tried Boom2 and that got the mute un-greyed but cannot use internal speakers, line out or anything else....really don't want to do a reinstall as I got the 960 running good and everything would be perfect if I could get audio....I've got Kextutiliyapp AND AppleHDA NVaudio but don't know which one to use...will keep reading here until I here from someone more knowledgeable....Thanks!
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The error under PCI devices is normal when using a PC Card. I would try reinstalling AppleHDA if you don't have any audio devices.
Thanks so much Hennesie! I now have HDMI with Boom2 working through my monitor! I was messing around with Midi and trying anything but those 2 kexts.....is there a way to get the chime and internal speaker, line-out etc back though? I have a line-out on the monitor if not...just wondering...I was so close to re-installing OS so again thank you!!!!
As I mentioned according to my problem as described here -- Frequently Asked Questions About NVIDIA PC (non-EFI) Graphics Cards -- I tried using the HDMI Audio kext version 1.1 provided, but I do not get an option to use HDMI audio for my monitor. My monitor is connected to the NVIDIA card via HDMI-to-HDMI, and the audio is present in Windows 7 after having updated the Realtek audio driver from the realtek web site. But I still have no audio with OS X 10.11.3. Please advise. Maybe I need to flash the GTX 750 Ti? I have no idea about how to do that. Does this HDMI Audio kernel extension work at all with 10.11.3?
What if you put the GTX 750 Ti in slot #1 and the Radeon HD 4870 in slot #2?As I mentioned according to my problem as described here -- Frequently Asked Questions About NVIDIA PC (non-EFI) Graphics Cards -- I tried using the HDMI Audio kext version 1.1 provided, but I do not get an option to use HDMI audio for my monitor. My monitor is connected to the NVIDIA card via HDMI-to-HDMI, and the audio is present in Windows 7 after having updated the Realtek audio driver from the realtek web site. But I still have no audio with OS X 10.11.3. Please advise. Maybe I need to flash the GTX 750 Ti? I have no idea about how to do that. Does this HDMI Audio kernel extension work at all with 10.11.3?
If I swap the GPU's, it reports that the GPU's are in different slots. The NVIDIA card is still "Television: Yes". And if I have only the NVIDIA card installed, and it is in slot 1, then:
My problem is not solved. I suspect that the HDMI Audio 1.1 kernel extension provided here simply does not work with my version of operating system. OS X does not recognize "HDMI Audio" or anything like that. Windows does. Does anyone have a link to the NVIDIA audio kernel extension that I can download? Maybe that, which the HDMI Audio was intended to replace, will work instead.
Optionally, it could be a problem with the Realtek drivers that Apple uses. Realtek has audio drivers updated, but maybe Apple needs to release an update to the Realtek audio drivers that let OS X properly negotiate having HDMI audio (with non-flashed NVIDIA cards) and the Realtek audio (hardware?) simultaneously. Or maybe if me or someone else could build the Linux drivers on the Realtek web site for El Capitan, that might work.
http://www.realtek.com.tw/downloads...=24&Level=4&Conn=3&DownTypeID=3&GetDown=false
When I try to install the linux version, ./configure does not know where to find the kernel. Obviously, it would be Apple's job to go ahead and update their kernel. However, they probably are content... with my inability to have audio in my Mac.
I will now attempt to downgrade to 10.10, to see if this HDMI Audio kext works on that kernel build.
My problem is not solved. I suspect that the HDMI Audio 1.1 kernel extension provided here simply does not work with my version of operating system. OS X does not recognize "HDMI Audio" or anything like that. Windows does. Does anyone have a link to the NVIDIA audio kernel extension that I can download? Maybe that, which the HDMI Audio was intended to replace, will work instead.
Optionally, it could be a problem with the Realtek drivers that Apple uses. Realtek has audio drivers updated, but maybe Apple needs to release an update to the Realtek audio drivers that let OS X properly negotiate having HDMI audio (with non-flashed NVIDIA cards) and the Realtek audio (hardware?) simultaneously. Or maybe if me or someone else could build the Linux drivers on the Realtek web site for El Capitan, that might work.
http://www.realtek.com.tw/downloads...=24&Level=4&Conn=3&DownTypeID=3&GetDown=false
When I try to install the linux version, ./configure does not know where to find the kernel. Obviously, it would be Apple's job to go ahead and update their kernel. However, they probably are content... with my inability to have audio in my Mac.
I will now attempt to downgrade to 10.10, to see if this HDMI Audio kext works on that kernel build.
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I have no idea what "SIP" as an acronym means. Therefore, no, I probably did not try turning it off.
I found this -- https://github.com/toleda/audio_hdmi_guides -- and so I'm going to try it before I go ahead and erase my hard drive to reinstall 10.10 for the HDMI Audio kext.
SIP means “System Integrity Protection”. It’s prevents unsigned and modified kexts from loading. It’s a great security feature, but it’s a big pain if you want to use an eGPU, third-party Solid State Drive or cDock(restores 3D dock).
As El Capitan natively support TRIM on 3rd party SSDs there is no issue with SIP.
TRIM on 3rd party Solid State Drives isn’t automatic. You have to enable it with Terminal commands or something like Trim Enabler. Yosemite didn’t have the software needed for enabling TRIM on 3rd party Solid State Drives, so even Trim Enabler and similar apps were rendered useless.
HDMI audio has never worked with maxwell based nvidia gpus, a class which your 750 card falls under I believe. Only one user has recorded success using a 980ti card but his results have, to my knowledge, not been duplicated by others. I have never been able to output HDMI audio through my 980 despite the feature working fine under Windows in bootcamp or previously in OSX with my 780.
And as others have pointed out, you can't boot with the kext installed in 10.11 unless you disable SIP first.
Yes but SIP is not part of Yosemite. Even though you have to enable it using "sudo trimforce enable" the support in El Capitan is there natively. Trim Emabler worked fine in Yosemite but you had to use the boot-arg kext-dev-mode=1.
Isn't the boot-arg kext-dev-mode=1 needed for all 3rd party unsigned kext in Yosemite?
Such as HDMIAudo.kext?
Such as HDMIAudo.kext?
I can confirm working HDMI audio on my 2012 Mac Pro 5.1 with OS X 10.11.0. This is using the 1.1 version. BUT it only works AFTER disabling SIP. Re-enabling SIP blocks everything again. Am updating to 10.11.3 as I type this so will see if I get the same result as 10.11.0. Video Card is Mac Pro Edition Sapphire Radeon 7950