M	ChromeOS	Chrome	ARC	Type	Channel
57	9173.0.0	57.0.2978.0	3629512	release	dev
Device: Sentry PVT 

SUMMARY:
HDMI is plugged.  Ensure audio setting in uber tray menu is showing HDMI is active.   Press power button to power off chrome device.  Hear audio from internal (on-board) output speaker right before the device is completely powered down.  So far this issue only happens on Sentry device among of samus, quawks and daisy.

STEPS:
1.  HDMI cable is plugged to a Sentry device.  
2.  Ensure audio setting in uber tray menu is showing HDMI is active.
3.  Play some kind of music.  I played music from youtube.com
4.  While music is playing, press power button to power off the device.

RESULTS:
unexpected:  Heard the playing music from internal speaker right before the device is completely powering down.
expected:    It should not hear music from internal speaker since active audio output is HDMI.

Additional notes:
The issue did not happen on samus, quawks and daisy.