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https://forums.lenovo.com/topic/findpost/1308/5012225/5042321 Once we apply the work around, we are stopping Windows Updates from pulling in driver updates.

Uninstalled all sound devices from devices manager and installed RealTek audio driver from the Lenovo ...

https://forums.lenovo.com/topic/findpost/1300/5114089/5581403 . I uninstalled the Intel Smart Sound Technology OED but the exclamation mark in front is still there.

Here is the Windows 10 sound driver for e440 . https://pcsupport.lenovo.com/us/en/products/LAPTOPS-AND-NETBOOKS/THINKPAD-EDGE-L

https://forums.lenovo.com/topic/findpost/2250/5036468/5148526 Hey Voithos, I had the same problem and your solution has solved mine so now I have sound again.