#7690 NORM 8.2.0 (: msh0 device does not come back up (nor NM/Sugar notified once it does) after power cycling radio via /sys/power/wlan_enabled

[Zarro Boogs per Child]

#7690: msh0 device does not come back up (nor NM/Sugar notified once it does)
after power cycling radio via /sys/power/wlan_enabled
----------------------------+-----------------------------------------------
   Reporter:  mtd           |       Owner:                                   
       Type:  defect        |      Status:  new                              
   Priority:  normal        |   Milestone:  8.2.0 (was Update.2)             
  Component:  not assigned  |     Version:  Development build as of this date
 Resolution:                |    Keywords:  blocks?:8.2.0                    
Next_action:  diagnose      |    Verified:  0                                
  Blockedby:  7740          |    Blocking:                                   
----------------------------+-----------------------------------------------

Comment(by gnu):

 Aha, I think I understand.  Eben modified his design with this comment
 buried in another bug: http://dev.laptop.org/ticket/5459#comment:10

 The problem with eliminating the "mesh off" button is that we lose huge
 power saving opportunities.

 I don't think Eben realized that when he made that design choice.  See the
 comments in #5144.  With the mesh off and an access point on, we save
 small or medium amounts of power -- and have an opportunity to power down
 the WiFi chip when the lid is closed, which saves major amounts of power
 while suspended (basically the laptop lasts much more than 8 hours in
 suspend).  With both the mesh and the access point off, the WiFi chip can
 also be powered down during suspend -- or all the time.

 In Eben's modified design, the only way to turn off the mesh is to turn on
 an access point.  That's counter-intuitive, and if there is no access
 point visible, there is no way to turn off the mesh at all -- which means
 we burn full power all the time.  The "Turn off" mesh action from the
 original design should be reinstated.

-- 
Ticket URL: <http://dev.laptop.org/ticket/7690#comment:7>
One Laptop Per Child <http://laptop.org/>
OLPC bug tracking system