Latitude 5400, no sound after May 2021 Windows update

We've had this problem on a couple machines as well- 

We've uninstalled/reinstalled all audio related drivers, one coworker replaced a motherboard and had no change (I'm about to do the same on Friday to see if my MOBO replacement fixes it), coworker is trying a fresh image on the new computer. 

We've tried directly installing realtek audio drivers from Dell's support pages. 

No audio through speakers, aux, or HDMI output- and we can't even get a post beep during diagnostics. 

We're stumped here. 

Even in our machines we have similar issues, would appreciate if any fix is known. Has anyone opened a case with Dell Support?

this will fix the problem until Dell comes out with a fix

1. Open CMD as admin loggerd on as local admin.

1. • net localgroup Administrators /add networkservice
   • net localgroup Administrators /add localservice
   • exit
2. After running those commands, close Command Prompt and restart your PC.

Hi 

Please open the device manager o your co puter to find the controllers.

Please leave a reply here!!

I will assist you in a best possible way!!

Hi have 500+ machines currently facing this issue. These are Latitude 3410 laptops however. The ease of access workaround works temporarily but we need an urgent resolution.

Spent some time troubleshooting this, no immediate fix other than a reload. Figure I would drop my notes below:

Notes

• 9 of 406 Dell 5400s are impacted within our enterprise. 
• OS: Win 10 1909 x64 for all.
• Issue appeared within 1-2 days after May Patches (2021-05 CUs) 
• Removed drivers, removed Max Pro/Realtek Audio software.
• Ran Dell Command Update, installed latest drivers. Issue persist. 
• Created Power Query report from Lansweeper Data (All Software installed)
  • Added all broken endpoints with a few good endpoints. Unable to identify a single piece of software the original nine have in common aside from a healthy endpoint. 
• Changing the Windows Audio Service "Log On" to use a Local System account over the Local Service account allows Windows Audio Service to run and show all audio devices. 
  • Reverting the previous change and restarting the service recreates the issue.
• Bypassing SCCM, using Microsoft Update to install June Patches )2021-06 CUs) fails on these broken endpoints. Works on healthy endpoints.
  • Multiple errors returned on updates from SCCM and Microsoft Update, one being 0x80070005 - Implies Access Denied  (Local Service account is getting more attention now...)
• Reloaded using standard Win 10 Task Sequence, updated drivers and patches. Unable to replicate issue on a known broke endpoint. 
• Synopsis: Reload endpoint, redeploy. Monitor help desk que for additional endpoints with symptoms. 

Can you define what you mean by 

• Reloaded using standard Win 10 Task Sequence, updated drivers and patches. Unable to replicate issue on a known broke endpoint. 

Hi, 

with have the similiar issue with new Dell Latitude 5520 Notebooks. But not all NBs have the Problem. 

If a person get called via CiscoJabber the sound from the microphone stops 3 to 20 seconds after answering the call. Is their a new status from Dell why this issues only occurs on Dell Machines?

Did you get a response from Dell Support?

We use SCCM/OSD to load endpoints with our standard image.

We are seeing this issue on Windows 10 1909 machines with June cumulative update, affecting the following models:  Latitude 5410, 5490   Precision 5540, 5550.   Dell have you found the solution yet?

Adding localservice to local admins fixes the problem but is obviously insecure. I think it’s because the Windows audio service relies on the localservice account which cannot do something required to start the service. Check your group policies for user rights assignment oddities. I’m still trying to figure out myself but will post any updates here. Have had a ticket open with Dell for a week but no reply. 

Hi Dell, What is the status of this?  We are seeing it on Latitude 5400, 5410, 5490 & Precision 5540 & 5550.

Please try these steps:

1. Roll back with system restore, and validate audio is working fine

2. Reboot, then run Dell Command Update or Dell Support Assist

        a. Install all drivers/bios/firmware updates suggested

3. Reboot

3. Install the windows update again, updating drivers prior resolved on one machine, but still have not found the       root cause