If you want to disable auto suspend indefinitely then do this:
$ sudo chown your_user /sys/module/usbcore/parameters/autosuspend
I use `vi` but you can use `nano`, `gedit` or whatever you fancy:
and add this line at the end of the file:
bash -c 'echo -1 > /sys/module/usbcore/parameters/autosuspend'
And for good measure you'll want to source the new script:
Note: this functionality only exists as long as it is in your .bashrc, reformatting / different user will void it.