"driver=" entry in /proc/bus/usb/devices??

Robert P. J. Day rpjday at crashcourse.ca
Tue Feb 26 08:43:09 UTC 2008

  from the user manual for VirtualBox related to accessing USB

"On Linux hosts, VirtualBox accesses USB devices on Linux through the
usbfs file system. Therefore, the user executing VirtualBox needs read
and write permission to the USB file system. Most distributions
provide a group (e.g. usbusers) which the VirtualBox user needs to be
added to. Also, VirtualBox can only proxy to virtual machines USB
devices which are not claimed by a Linux host USB driver. Please refer
to the driver= entry in /proc/bus/usb/devices to see which devices are

  my questions:

1) what means this "driver=" entry in /proc/bus/usb/devices?  never
heard of it.  it certainly doesn't appear to exist on fedora.  did it

2) i also see no evidence of a "usbusers" group on fedora. in any
event, since standard USB access seems to be working, i'm guessing
those two issues aren't relevant WRT fedora.  should i care?



Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry:
    Have classroom, will lecture.

http://crashcourse.ca                          Waterloo, Ontario, CANADA

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