linux-2.6/Documentation/usb/power-management.txt
power/autosuspend
This file contains an integer value, which is the
number of seconds the device should remain idle before
the kernel will autosuspend it (the idle-delay time).
The default is 2. 0 means to autosuspend as soon as
the device becomes idle, and -1 means never to
autosuspend. You can write a number to the file to
change the autosuspend idle-delay time.
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Powertop suggest to add usbcore.autosuspend=1 to grub's kernel line, doesn't
work
https://bugs.launchpad.net/bugs/136549
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