Ticket #1423 (closed defect: fixed)
USB power managment.
|Reported by:||jg||Owned by:||marcelo|
|Deployments affected:||Blocked By:|
Description (last modified by rsmith) (diff)
This bug is to track issues pertaining to USB power management. First, we need to confirm that our USB class drivers work properly. Marcelo was working on the stack a while back.
This is an active area of Linux development at the moment, so it will likely need continual reverification in the tinderbox.
Arguably, this may need to interact with a power manager daemon, to set policy as to whether the system should suspend.
And how USB devices that can suspend should deal with our fast suspend/resume is anyone's guess.
Its not clear yet on just how to measure this. USB +5 is switched by U56 and there is not a sense resistor there. One possibility is to break the line at the +5V regulator @ L28 and then do subtract out the current across R397. That would give you whats happening on USB. We could take a baseline with no USB devices plugged in and subtract out that as well.