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What: /sys/bus/usb/devices/.../power/autosuspend | ||
Date: March 2007 | ||
KernelVersion: 2.6.21 | ||
Contact: Alan Stern <stern@rowland.harvard.edu> | ||
Description: | ||
Each USB device directory will contain a file named | ||
power/autosuspend. This file holds the time (in seconds) | ||
the device must be idle before it will be autosuspended. | ||
0 means the device will be autosuspended as soon as | ||
possible. Negative values will prevent the device from | ||
being autosuspended at all, and writing a negative value | ||
will resume the device if it is already suspended. | ||
|
||
The autosuspend delay for newly-created devices is set to | ||
the value of the usbcore.autosuspend module parameter. | ||
|
||
What: /sys/bus/usb/devices/.../power/level | ||
Date: March 2007 | ||
KernelVersion: 2.6.21 | ||
Contact: Alan Stern <stern@rowland.harvard.edu> | ||
Description: | ||
Each USB device directory will contain a file named | ||
power/level. This file holds a power-level setting for | ||
the device, one of "on", "auto", or "suspend". | ||
|
||
"on" means that the device is not allowed to autosuspend, | ||
although normal suspends for system sleep will still | ||
be honored. "auto" means the device will autosuspend | ||
and autoresume in the usual manner, according to the | ||
capabilities of its driver. "suspend" means the device | ||
is forced into a suspended state and it will not autoresume | ||
in response to I/O requests. However remote-wakeup requests | ||
from the device may still be enabled (the remote-wakeup | ||
setting is controlled separately by the power/wakeup | ||
attribute). | ||
|
||
During normal use, devices should be left in the "auto" | ||
level. The other levels are meant for administrative uses. | ||
If you want to suspend a device immediately but leave it | ||
free to wake up in response to I/O requests, you should | ||
write "0" to power/autosuspend. |
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