Moving to another desktop. Will not pursue this issue further. Thanks.
Bought my 3rd XPS this past July. Out-of-the-box the new XPS 8940 ran great. 2nd day, I foolishly ran SupportAssist; end-result: updated drivers, dead Ethernet port, 3 dead audio ports. Ethernet port required OS reinstall. Restored audio, somewhat. Via Sound UI (context menu from Speaker Icon in System Tray), Dell 5650 5.1 surround sound speakers appear correctly configured and pass 5.1 sound test. Every other piece of software I have run, only outputs stereo. No joy via Dell tech support. Ideas? XPS 8940 Specifications Processor            11th Gen Intel(R) Core(TM) i9-11900K @ 3.50GHz   3.50 GHz Installed RAM    64.0 GB (63.7 GB usable) System type        64-bit operating system, x64-based processor Pen and touch   No pen or touch input is available for this display OS Specifications Edition  Windows 10 Pro Version 21H1 Installed on        ‎7/‎12/‎2021 OS build               19043.1165 Experience          Windows Feature Experience Pack 120.2212.3530.0
XPS 8940, 5.1 sound tested, only stereo output