Dell Latitude e7470 strange audio „crackle“ on fresh ubuntu 16.04 LTS

I notice a strange crackle while booting my new Dell Latitude E7470 with a fresh ubuntu on it. It happens twice on every boot. Once before entering the password and once after successful login.

I found a solution by toying around with the alsamixer.

For me the solution is to disable the loopback channel.

Start alsamixer with this command:
alsamixer -c0

  • Naviagate to the Loopback channel rightmost with arrow-key
  • Disable the Channel by pressing the arrow-down-key once
  • Save and quit the alsamixer with ESC
alsamixer

alsamixer

After that you need to reboot. The crackle is gone.

Have fun…

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