[FS#1180] Buffalo WZR-600DHP: Wifi drops out every few hours

[LEDE Bugs]

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

User who did this - Luke Dashjr (luke-jr) 

Attached to Project - LEDE Project
Summary - Buffalo WZR-600DHP: Wifi drops out every few hours
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Every few hours, the Wifi on my WZR-600DHP drops out. It comes back on, but the drop out is annoying (in part, because I have at least two devices I must reboot to get reconnected).

I've identified the problem as caused by package/kernel/mac80211/patches/305-ath9k-limit-retries-for-powersave-response-frames.patch - if I neuter this (by forcing ps=false), the problem goes away. To identify the cause, I bisected the entire LEDE git history going back to 2012 (Attitude Adjustment), so I can also confirm that the problem has existed ever since the patch was first introduced in b30e092de65ca7be7cb277f934016484137d924c (July 2015).

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1180