Windows11 no audio via HDMI to the 5.1 speakers as soon as projector is ON - working ok on Windows 7 and 10.

Then where are the results of the fixes I spent an hour finding for you and asked you to post back detailed results for, so I know what else to suggest if necessary?

There were over a dozen fixes to try, instead you skipped to the last-resort referrals I gave to others who could help, too, as though that was all I suggested.

This is an interactive process. I give steps to perform, you do each one and then report back results until something works, so I know what to suggest next. If you need help performing any step, just ask back. But please do not skip any steps. We often find out the skipped step is the fix.

This is windows 11 issue. That is why i am asking here. There is no evidence that it has anything to do with other companies or providers of hardware.

All evidences pointing to the windows 11 software bug at this moment.

Hello again Michał -

Try these additional fixes for Epson projector sound to see if they help:

https://epson.com/faq/SPT_V11HA07020~faq-00003f...

https://epson.com/faq/SPT_V11H879520~faq-00003e...

https://files.support.epson.com/docid/cpd4/cpd4...

https://files.support.epson.com/htmldocs/bl425w...

https://thewiredshopper.com/how-to-get-sound-fr...

https://www.youtube.com/watch?v=Z_mpzc1CnvI

https://www.youtube.com/watch?v=oOVmSvqPLhs

https://www.youtube.com/watch?v=L53_IdZq7-0

If none of those help I would ask Epson projector support:

https://epson.com/Support/Projectors/sh/s3

Also the best Epson projector forum:

https://www.avforums.com/tags/epson-projector/

Also ask Dell Support here:

https://www.dell.com/support/home/en-us

And in Dell forums:

https://www.dell.com/community/Dell-Community/c...

You can also ask in the best hardware forums Tom's Hardware here: https://forums.tomshardware.com/

Hopefully this will widen the net to find others who have had this problem or know how to handle it. We have done everything that can be done here for Windows own interface.

Keep me posted on your progress as I will be here to help until the case is resolved.

____________________________________________

Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.

Hi. Thanks for answering.

I've spent several hours going step by step through your suggestions. There is no positive effect. What i achived is adding new Intel driver for the graphics instead of one proveded by the Dell.

It seems that windows 11 is behaving differently from win7 and 10 in this particular case. As soon as i plug the laptop to the sony "home theater" via HDMI, SONY it is recognized by the windows 11 system. Proper HD Audio device for Display Audio pops up on the device manager list and there is SONY AVAMP device in audio output list as it shoud be (see below).

BUT as soon as i start up EPSON projector connected to the SONY, HD Audio device for Display Audio disaperas from the device manager list and so audio output device. In such case laptop is starting to play audio via internal speakers (realtek AUDIO), video is being transmited via Sony to the Epson as expected.

Projector does not have internal speakers. It is like windows 11 is getting by PnP or something info that projector cannot be target for audio and compleatly disregard the fact that there is 5.1 audio system inbetween.

Once again. It is working perfectly on windows 10 for example or windows 7. I have never had anny issues with this setup till windows 11.

Any suggestions?

Hello Michal. I'm Greg, here to help you with this.

Try these fixes for projector loses HDMI sound in Windows 11:

https://windowsreport.com/projector-wont-play-s...

(Avoid ad links which intrude into editorial copy, especially DO NOT INSTALL Restoro, PC Repair Tool and Reimage ads)

https://forums.tomsguide.com/threads/hdmi-lapto...

https://forums.tomsguide.com/threads/hdmi-lapto...

https://www.eiki.com/eiki-faqs/why-do-i-get-an-...

https://www.asavvyweb.com/windows/how-to-fix-hd...

2. Update the Sound controller driver from the PC or motherboard maker's Support Downloads webpage for your exact model. While there compare to make sure you also have the latest BIOS, Chipset, Display, Network and all other drivers.

If no newer then uninstall the Sound controller driver in Device Manager, restart PC to reinstall it.

Next go into Device Manager, right click Sound controller driver to Upgrade driver, then Automatically.

If nothing newer found in Windows Update then try again but this time choose Upgrade Driver > Browse > Let Me Pick to try all previous drivers queued there.

3. The Display driver is so important that merely updating it might not be enough. Try everything here to make sure: https://answers.microsoft.com/en-us/windows/for...

If nothing else helps I would ask in the Dell Community: https://www.dell.com/community/Dell-Community/c... and also the best hardware forums Tom's Hardware here: https://forums.tomshardware.com/

Feel free to ask back any questions. Based on the detailed results you post back, I will have other suggestions if necessary.

______________________________________________

Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.