Ticket #6935 (closed defect: fixed)
Turn off USB?
|Reported by:||cjb||Owned by:||rsmith|
|Action Needed:||never set||Verified:||no|
|Deployments affected:||Blocked By:|
I'm working on a manually-selected UI mode that does best possible efforts to preserve power. It can be thought of as the "reading under the covers" mode that tries to prolong your battery while you're alone. Namely, it would:
- turn on automatic idle suspends
- turn off networking
- possibly use the camera to detect external lighting, and modify the backlight brightness according to how bright the environment is (turning it off altogether if you're outside).
The "turn off networking" part won't gain us much at the moment, because even unloading the wireless module doesn't stop the power draw of the 8388 -- we can't disable power to its rail altogether, because it's the main 3.3V rail. We should instead put it into reset for the duration of the low-power mode.
Richard, please point us at the documentation for doing this (via the EC?). Andres or Dave, please think about how userspace (with root) could ask for USB to be turned off completely until it wants to turn it back on again. The rationale for dropping USB completely is that it lets us show how good our suspend/resume times will be once we have USB resume put in its place. (Hey, it might also save power.)