[FS#974] ipq806x: running "reboot" actually shutdowns the device on TP-Link Archer C2600

[LEDE Bugs]

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

User who did this - Baptiste Jonglez (bjonglez) 

Attached to Project - LEDE Project
Summary - ipq806x: running "reboot" actually shutdowns the device on TP-Link Archer C2600
Task Type - Bug Report
Category - Base system
Status - New
Assigned To - 
Operating System - All
Severity - Low
Priority - Low
Reported Version - lede-17.01
Due in Version - Undecided
Due Date - Undecided
Details - On a TP-Link Archer C2600 v1.1 running LEDE 17.01.2, running "reboot" does not work as expected.

The device becomes unreachable, all LEDs turn off, but then the device never boots back up.  A physical power cycle is needed to properly reboot the device.

Power consumption in this "zombie" state is about 5 W (measured on the plug), while the normal power consumption when idle is around 9 W.

When running "shutdown" from LEDE instead, the LEDs also turn off and the device becomes unreachable, but power consumption stays at 9 W.

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=974