I happened across these posts when revisiting an old, persistent problem for me, i.e. I've always suffered from the issue described here, whereby the only way to get the sound working in my HP Reverb G2 is to repeatedly switch if off-and-on-again until something mysterious changes. When it isn't working Windows lists the Reverb G2 sound output as "Headphones" and when it does as "Speakers". Did anyone find a definitive solution to this please?
I've tried different BIOS versions, completely expunged the Realtek drivers from my PC and reinstalled them, removed USB drivers and have them reinstall again and in terms of hardware I've tried both powered USB hubs and two different PCIe USB cards... and nothing works! I've also tried both the "old" (v1) cable and "new" (v2) cable.
MSI MPG Z490 GAMING EDGE WIFI (PCIe 3)
i9-10900KF
RTX 3090 FE
64 Gb RAM
Windows 10 64-bit 21H2
In case it is related I should also mention that whenever the sound on my Reverb G2 does work, I use it, then I close WMR (and disconnect the G2) I do not get any sound through my conventional speakers until I restart my PC!
Never resolved for me despite v2 cable, bios updates etc. Does seem to be temperature related imo - happens less in the summer and would explain why leaving it plugged in for a bit first to warm up "fixes" it on the next power cycle.