hmm... good question!
i taked a look to the last git kernel_source and there is no support of procfs 
( or i didn't found ) ,  it seems to support sysfs but it was added later for 
2.6.21
Te is module parherameter usb_autosuspend_delay for usbcore  you can try to set 
it to usb_autosuspend_delay=0 or to 60:
sudo gedit /etc/modprobe.d/options
options usbcore usb_autosuspend_delay=0

it can be this option working only with kernel 2.6.21

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