[SOLVED] Screen flickering when enabling HDMI Audio, all methods tried.

[Eightarmedpet]

Now here is an odd one...

I had a perfectly working Hackintosh but then treated myself to a new 4K TV, it works perfectly in Windows but has flickering (slow) in macOS - it comes on for 1-2 seconds then goes off for 2-3 seconds.
I fancied a bit of a brush up on installing so I started afresh wit ha new SSD. All went well and it was a pretty painless install, USB's all work, BT works, Wifi, prob Ethernet although I haven't tried, and no screen flickering. The only problem is when I try to get HDMI Audio working the flickering comes back.

I used Toldedas auto detect script.
I undid it (swapped out EFI folder).
I used HDMI kext.
I undid it (deleted kext).
I used the simple HDMI guide and SSDT file
Again, removed the file I added.

Each time, as soon as HDMI audio was enabled the flickering came back, which I am aware makes little sense. Could it be anything to do with HDMI bandwidth?

Details:
Samsung 9 Series (Serif) 4K TV
10.12.2
Nvidia drivers

 

[Eightarmedpet]

Note:
On my previous 10.11 install when I booted with nv_disable=1 the flickering disappeared but the res was something awful (HDMI Audio was fine though).

 

[Eightarmedpet]

Bought new HDMI cables to check if they are the issue, will update thread in case anyone else has the same problem if/when I solve it.

 

[Eightarmedpet]

UPDATE: Somewhat embarrassingly, turns out it was the cable. I assume the original one was a lover grade/spec HDMI cable. Bought a decent "4K yada yada" spec one and no longer have the issue.

I had a suspicion it was something to do with bandwidth through the cable and looks like I was right and a simple hardware swap fixed the issue.

Thanks all, it's been emotional.