I have Dell XPS 13 (running Windows 10 Home) and D1000 dock connected to it. I have a 5.1 sound system connected to the D1000 through the HDMI port.
Things I already have done:
Is the D1000 capable of playing 5.1 audio through the HDMI port? If so, what do I need to do to make that happen in my case?
* Click my name and private message me the XPS 13 and D1000 service tag numbers. Or the D1000 Dell order number
* Do you get 5.1 audio when the D1000 is removed and the XPS 13 is connecting directly to the 5.1 sound system?
* Explain in detail how the XPS 13, D1000, and the 5.1 sound system are connecting using all ports and cabling.
* The D1000 User's Guide does not mention 5.1 audio. All it states is, "Combo Audio (Headphone/Mic)", page 3.
* Page 8 states that the DisplayLink Manager Menu has an Audio Setup Menu that; "Opens the Windows Audio Configuration window".
The Dxxxx series docks use DisplayLink chips to interface with the system, and I'm going to guess that given the D1000's age, the DisplayLink chipset version it has doesn't support 5.1 audio even through the HDMI output. You didn't specify which XPS 13 generation you have, but if you have one with a USB-C/Thunderbolt 3 port, you might want to consider a dock model that doesn't rely on DisplayLink at all since it can come with some serious drawbacks that I've described in the post marked as the answer on this thread. Since you mention 5.1 audio, I'm guessing you're probably trying to either watch movies or play games, and those are two of the absolute worst possible use cases for DisplayLink technology. If you don't have USB-C/TB3 and DisplayLink is your only option, then a dock with newer chipset would likely solve this (there are third-party DisplayLink docks too, fyi), but you might still find that DisplayLink delivers an unacceptable experience for what you're trying to do.
Btw, I found this guide from DisplayLink about multi-channel audio, although again I don't know if it will apply to your chipset.