No this has not been resolved.
I suspect the 5.1 signal is carried through as DD+ and would only work with HDMI.
I only have optical, so no luck.
May i suggest getting a HDMI Optical splitter then I know a friend who has one for his Computer set up so he can use HDMI and his speaker set up. Amazon do a good one on there Amazon Basics package that should allow you to use 5.1 over optical