[FS#844] WMM Mode bug with Wifi 2,4Ghz Archer C7 1750 V2 with LEDE 17.01.1 and 17.01.2

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Mathieu (Jamb_o) 

Attached to Project - LEDE Project
Summary - WMM Mode bug with Wifi 2,4Ghz  Archer C7 1750 V2 with LEDE 17.01.1 and 17.01.2
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - lede-17.01
Due in Version - Undecided
Due Date - Undecided
Details - Hi,

I meet a bug with certain ring roads(peripherals) (Xbox 360 and Epson SX425) using the WiFi 2,4Ghz of my TP(PRACTICAL CLASS) Link Archer C7 1750 under LEDE 17.01.2 (noticed also with LEDE 17.01.1) with activated WMM mode.

When WMM mode is active ring roads(peripherals) Xbox 360 and Epson SX425 does not receive an IP address while quite my other PC works carefree in WiFi 2,4Ghz.

By deactivating WMM mode and by restarting the router(route planner) everything works perfectly.

I specify that with OpenWrt 15.05.1 WMM Mode worked perfectly.

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=844