Chrome Version       : 53.0.2785.47
OS Version: 8530.43.0
URLs (if applicable) :

What steps will reproduce the problem?
1. Attach HDMI external display 
2. Open lid
3. The external display wakes up 
4. The Chromebook begins automatically negotiating with the display to mirror/extend

What is the expected result?
The display is mirrored/extended

What happens instead of that?
The display negotiation never completes successfully


Please provide any additional information below. Attach a screenshot if
possible.

Using Ctrl+[Fullscreen] is eventually successful but can take up to 20-ish attempts. It appears to try harder each 5th attempt or so (with a longer black screen pause while it is trying) and that is the type of attempt that is likely to work. 

The display is a Dell S2409W

I have included a video of what I am seeing via a Google Photos shared album - let me know if you would prefer the video to be attached to the bug:
https://goo.gl/photos/KnZ8hq81oZgdTZpKA

- Mike

UserAgentString: Mozilla/5.0 (X11; CrOS x86_64 8530.43.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.47 Safari/537.36