If you are experiencing issues with audio on your laptop, specifically related to the Realtek devices, and you have already tried updating the drivers from the Dell website, here are some additional steps you can take:
Hey I just posted a possible solution. Check your hardware ids for both realtek devices. In my case they were different hardware ids all together so windows was automatically installing the wrong driver!I didn't see Intel smart audio in the dell drivers so I used iobit driver booster to update all the drivers in the system and everything started working fine afterwards I'm thinking I found the solution.
So I noticed something interesting. The 2 separate realtek devices had 2 different hardware ID's!!1 was hdaudio (which is realtek)Another was Intel smart audio. I left both devices as is (both as realtek) and decided to use iobit driver booster to update all of the drivers in The system. Well to my surprise, after a restart, the sound started working again and it was only 1 realtek audio device. Time will tell if this was the permanent fix but I have a good feeling about it.
Curious about the reason? The ALSA drivers don't support microphones for my soundcard (Creative Sound Blaster 5.1 VX). Also, It does not handle audio output quite well. I have issues. Also, I'd really like some software like the windows-only "Realtek Audio Manager" that does effects to the audio such as echoes and so on.