Version: 51,52 and 53
OS: ChromeOS
Access points: HP MSM 430 and HP MSM 560 
Chromebooks: EduGear M4


Issue Description:
Enterprise customer is experiencing slowness when EduGear M4 Chromebooks try to connect to HP MSM 430 Access points after version 50 (affected version 51,52 and 53). All other devices and access points work fine.


Error in the logs: (repeat over and over)
"ERR wpa_supplicant[447]: WMM AC: Missing IEs"


PII protected logs:
https://drive.google.com/drive/folders/0B6fESMmJITTNTFNqS3FrZW1IcFk?usp=sharing


What steps will reproduce the problem?
(1) Connect EduGear M4 to network (MSM 430 AP's)
(2) Experience extreme slowness or failure to connect to wifi


What is the expected output?
Should connect like other devices


What do you see instead?
Extreme slowness/failure.