Intel HD audio not showing in device manager or anywhere in laptop, so when I connect HDMI on TV it won't produce sound on TV, but only on laptop.
I've tried following:
1. Dowloaing drivers from Asus site
2. Deleting drivers from device and let Windows instal them automaticaly
3. Reinstaling NVIDIA graphic from ASUS
4. Downloading and reinstaling Realtek audio driver from ASUS
I've tried in Linux and sound works, so it's something in Windows Update 1903
If audio output is working in the laptop, I would presume that the output path is through the RealTek CODEC. When you specifically have the RealTek solution selected as default and the laptop display as primary, no automatic switching will occur when a secondary monitor is attached. When you connect this monitor, if you want its audio output path used, you will have to go into the audio mixer and manually select that it be used.
Hope this helps,