Link to the failure :https://pantheon.corp.google.com/storage/browser/chromeos-autotest-results/198358614-chromeos-test/chromeos6-row2-rack18-host20

Failure message:
TestFail: iteration 0:rms_value > 0.05: constraint was not met

Postmortem report says:
05/08 06:29:56.520 INFO |      audio_helper:0212| Headphone jack status: True
05/08 06:29:56.521 DEBUG|             utils:0214| Running 'loopback_latency -n 4000 -c'
05/08 06:29:57.744 DEBUG|             utils:0282| [stdout] Audio not detected.
05/08 06:29:57.849 INFO |      audio_helper:0223| Latency check fail.
05/08 06:29:57.850 INFO |      audio_helper:0227| audio loopback dongle test: FAIL

I am suspecting the dongle is broken.
Kain - Can you help double check dongle status on this machine? Thanks!