I did some research a number of years ago about getting discrete 5.1 or 7.1 audio from either an onboard or dedicated sound card when using a digital connection such as SPDIF/Optical to a capable ...
I have an older Panasonic TC P50ST30 (release review/specs here) that was generously given to be by another Arsian that does have ARC support (I think). The TV sitting in front of an old but nicer ...