I upgraded my PC to build 2004. I found my realtek audio is not working at all. HDMI audio was working. But my speakers were not working. I reverted to my old build 1909 and audio started working. Is there any bug in build 2004? When will that get resolved?
what kind of computer are you using, SabyasachiBose? run either Dxdiag.exe or MSInfo32.exe from the Run dialog box to gather details about your computer (esp. make & model)
Audio through HDMI uses a separate driver which is usually not Realtek related and the HDMI driver may come with the graphics driver package.
try obtaining an updated Realtek audio driver from either the PC manufacturer's support site or from this MS Update Catalog link.