[FS#1079] Wifi 5GHz & Kernel 4.4 vs 4.9 [Netgear R8000/bcm53xx]

[LEDE Bugs]

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

User who did this - Manus Freedom (manusfreedom) 

Attached to Project - LEDE Project
Summary - Wifi 5GHz & Kernel 4.4 vs 4.9 [Netgear R8000/bcm53xx]
Task Type - Bug Report
Category - Kernel
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Critical
Priority - Very Low
Reported Version - All
Due in Version - Undecided
Due Date - Undecided
Details - Tested on Netgear R8000/bcm53xx
LEDE Reboot SNAPSHOT r5099-5fff2f4 / LuCI Master (git-17.289.64212-462779c)

Since Kernel 4.9, the Wifi 5GHz (radio 0 and radio 2) does not work: visible, but unable to connect or disconnected after few seconds (unable to receive IP at all).

Today, I tested to compile the build but with the previous kernel 4.4, all Wifi 5GHz work.

The LEDE config (on the device) are strictly identical between both tests.

Attached all files about both build.

One or more files have been attached.

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1079