Win HOW TO - Fix Loss of HDMI Audio After Resume from Sleep Using an EDID Override
#46
(2020-02-11, 12:04)Warner306 Wrote: I haven't tried it in a long time, so I'm not sure if Windows still accepts custom drivers. You could also try the Pin 19 trick mentioned. Or leave the PC powered on at all times.

I don't think so. You can install while driver signing is off, but it will be replaced by a Microsoft driver, once you enable driver signing again.

EDIT: YOu can keep the modieifed INF file, by turning off automatica hardware install under control panel system and hardware tab. Then the modded INF remains.

But still my system does not recognize the HDMI Audio as connected, while at the same time outputting video over HDMI.

Right now even without turning off the monitor, it is a hit and miss whether you will get Audio over HDMI or not.

I cant believe Intel is unable to provide a working driver for this for years now.

I have no Idea what makes the system detect the HDMI Port as Audio output.

I have tested several older drivers too. Once the device is listed as Intel® Display Audio, which happens if you use a newer driver, then there is no HDMI device under the Audio control panel ata lla.

If you use an older driver, from microsoft, which you get if you keep removing all intel drivers, then the HDMI device under device manager is not named"Intel® Display Audio" but "High Definition Audio Device" and the HDMI device sjhows up under the Audio control panel ab, but as "Not Plugged In" .

I know for fact that I had Audio output over HDMI on this same system in the past. Often times when the hdmi audi was shown as not connected, I just had to restart the audio drivers or restart and HDMI Audio would be back again.

This issue just occurs on Intel IGPU. Nvidia seems to have figured it out, and I can get Audio over HDMI reliably when using a Nvidia device.
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#47
I did some further testing and it is definitely a Intel driver issue.

The Monitor does provide correct edid data. There is no need to modify it. I have installed a 8 year old AMD GPU and Audio over HDMI works instantly. WIndows automatically installs the correct drivers and HDMI is automatically selected as output device. It just works auto-magically.

Nvidia and AMD GPU'S are able to output audio over HDMI just fine, so neither the monitor, nor the cable are a problem.

I have also tried a dozen different intel GPU drivers. Not a single one works.

I also tweaked around BIOS settings, as some posts indicated changing CSM or FastBoot.

But nothing except Intels drivers are a problem here.

It's so sad, this problem has been around for years now without ever having been addressed.
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HOW TO - Fix Loss of HDMI Audio After Resume from Sleep Using an EDID Override52
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