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Z170 Gaming-ITX/ac Loses Audio on HDMI2 @ 4K

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hiluke View Drop Down

Joined: 01 Mar 2016
Location: Sydney
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Post Options Post Options   Thanks (1) Thanks(1)   Quote hiluke Quote  Post ReplyReply Direct Link To This Post Posted: 11 Jan 2017 at 6:42pm
OK I managed to find out the fix. Audio is now working on HDMI2 4K at 60Hz.
Turns out I didn't have the latest version of the HDMI firmware.
I was running on v1.36, however updating to v1.48 has resolved the issues.

I missed this, as the ASRock download page listed the date the HDMI firmware updater was updated was 9/9/2015.
I hadn't built my computer until Feb 2016, I thought that I had already downloaded the latest HDMI firmware updater. Turns out that that date on the website is incorrect and there was a newer firmware.

1.36 BIN file date: 26 October 2015
1.48 BIN file date: 10 March 2016

All working now. :D

Edited by hiluke - 11 Jan 2017 at 6:42pm
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hiluke View Drop Down

Joined: 01 Mar 2016
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Post Options Post Options   Thanks (0) Thanks(0)   Quote hiluke Quote  Post ReplyReply Direct Link To This Post Posted: 29 Dec 2016 at 3:03pm
Hi everyone, hoping someone can help me out with something simple I may have missed.
I am losing audio output from the PC when running on HDMI2 @ 4K.
I've read through a few threads similar to my problems, but not quite the same (mostly with display, not audio issues).

My old 1080p TV recently died, so I have upgraded to a 4K TV (Samsung UA55KS8000W).

I had previously had my computer connected via HDMI2 to the old TV, running at 1080p.

On setting up my new TV, I plugged in the computer using the same port and cable to the new TV.
The resolution updated to 4K (3840 ? 2160), all good.
I updated the refresh rate to 60p Hz in the Intel Graphics Properties and all looked good.
Watching a video for a while, I noticed that every 10-15mins the audio cut out for a second and then came back. Thought it was weird, so started looking into it.

I then noticed that if I left it for a while (turn off the TV and come back, or watch TV input and come back), I would still get the video from the PC, however audio completely stopped working. It's as though the PC just decides to stop sending audio over HDMI if not used for a while.
Looking at the Playback Devices for the TV in Sound, the green bars move which indicates that it thinks it is playing audio, but nothing comes out the TV speakers.
Restarting the TV doesn't change anything.
Turning the PC off and then booting up again, the sound does come back temporarily.

What I have tried:
HDMI2 4K at 60p Hz - audio stops working
HDMI2 4K at 30p Hz - audio stops working
HDMI1 4K at 30p Hz - I have no issues at all - audio appears to be fine.
I also tried disabling Realtek High Definition Audio under Sound, video and game controllers in device manager, but this didn't change anything.
I switched HDMI cables, and got the same result using two different cables.
I switched HDMI ports on the TV, and got the same result.
My computer is set to never sleep, and the screen turns off after 20 minutes.

I updated all of the drivers and UEFI when this started happening, but it hasn't made any difference.
UEFI: 7.10 (I was running 1.80 and getting the same problems) Maybe I need to try a version in between?
Intel HD Graphics 530 Driver: (24/10/2016)
Intel Display Audio Driver: (5/10/2016)
HDMI Firmware (using the updater): 1.36

PC Specs:
OS: Windows 10
Motherboard: ASRock Fatal1ty Z170 Gaming-ITX/ac (onboard graphics)
CPU: Intel Core i5 6600
RAM: Corsair Vengeance LPX CMK16GX4M2B3200C16 16GB (2x8GB) DDR4
PSU: Silverstone 600W ST60F-PS Power Supply, 80Plus Silver
M.2 NVME: Samsung 950 Pro Series 512GB M.2 SSD
3 other 3.5" HDDs

I've done some reading and it looks like HDMI2 has a different manufacturer than HDMI1.
But only HDMI2 can give me 4K @ 60p Hz, so I would rather 60p Hz than keep 30p Hz on HDMI1.

I am not sure why the audio completely cuts out on HDMI2, while it is fine on HDMI1.

Is anyone able to suggest what I am missing?
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