valkko

If your laptop is Lenovo on Windows 10 i strongly recommend You to update your audio drivers. The last update Will get You dolby.

Your default audio device is nvidia HD audio. I assume You connected your graphics card to the tv or the receiver via hdmi. Change it on sound properties, and make your sound bar the default sound device.

If You have a nvidia graphics card is whorth to check if wake on lan is active in your nvidia control panel

Optical is limited by the standard to 48 khz, anything above that Frequency Will cause distortion

Optical is a standart with bandwith limitations. 5.1 is possible only via compressed signal and is up to the receiver if can decode the signal or not . Based on your description, the reason why your audio receiver is only playing stereo is becouse: - not all smart tvs output 5.1 compressed audio via optical. many just send stereo signal. - meanly becouse if you hook up your nvidia card to your tv, the EDID code from the tv will tell the card to send only R L sound signal (stereo). EDID codes act like an id between devices over hdmi and stablishe how the sound is delivered, 2.0

Uninstalling the realtek drivers will do the trick. Windows 10 drivers are good enough

I agree, maybe use this with the bt adapter https://www.amazon.com/Musou-Digital-Optical-Converter-Adapter/dp/B01AWBA8U8/ref=sr_1_3?ie=UTF8&qid=1550498983&sr=8-3&keywords=fiber+to+rca

You don't need a bt sounbar. Just buy a bt adapter to hook up your 3.5 mm output from your tv ro the RCA input ports to a bt transmiter like this one https://www.amazon.com/Logitech-Bluetooth-Audio-Adapter-Streaming/dp/B00IQBSW28/ref=mp_s_a_1_1?crid=1UQ1IM6O268C4&keywords=logitech+bt+adapter&qid=1550493916&s=gateway&sprefix=Logitech+bt+&sr=8-1 Aditionally you Will need a 3.5 mm to RCA cable to make it works

https://www.amazon.com/Splitter-Amplifier-Composite-QiCheng-LYS/dp/B07BK55NVX/ref=mp_s_a_1_3?ie=UTF8&qid=1549832527&sr=8-3&pi=AC_SX236_SY340_FMwebp_QL65&keywords=multi+splitter+rca&dpPl=1&dpID=41mMO7NIF9L&ref=plSrch. Not balanced

Start by unistalling rog HD audio drivers. The Windows default audio drivers are good enough, more compatible and more stable

Try another psu

The answer for your question is here http://www.tomsguide.com/answers/id-3145031/ps4-home-theatre.html

I use these http://www.trustedreviews.com/reviews/sony-h-ear-on-mdr-100aap, so far so good

Logitech 980

It's possible and I did it. I have the same setup that you describe, except for the LG tv (I own a Samsung tv). I run windows 7 Ultimate. So bear in mind when you follow this steps. - Setup your tv to playback sound over external speakers (Check the user manual) - Connect one extreme of your optical cable to the optical output from your tv - Connect the other extreme to the S/pdif optical in of the sound card - Connect the green, orange and black 3.5 mm cables to the front panel of the sound card - To make windows playback from the optical cable over