According to Microsoft,SeptemberWindows10 v1809 has not been officially released, Intel released to the OEM manufacturer of the 18.104.22.16844, 22.214.171.12445 version of the wrong driver has turned on a feature that Windows does not support, resulting in users upgrade the latest version of the system, through HDMI, USB -C, DisplayPort interface External display or TV opportunity has no sound.
If your device has the above drivers installed, Windows 10 v1809 will not push the upgrade.
Microsoft is also working with Intel and will soon be given a solution, but there is no timetable. Prior to this, the Intel 09.21.00.3755 version of the Smart Sound driver had caused the Windows 10 v1809 system to sound abnormally and returned to normal after the upgrade.
In addition,Microsoft is also working with Realtek to resolve sound card driver compatibility issues, working with Trend Micro to resolve security software compatibility issues, and working with AMD to resolve HD 2000/4000 graphics driver compatibility issues...