I tested on wheezy using a buildbot deb linuxcnc_2.6.1.1.gf0c9384_i386.deb
(instead of the iso) and see:

  $ lsb_release -rc
  Release:      7.6
  Codename:     wheezy

  $ uname -a
  Linux debian-shop2 3.4-9-rtai-686-pae #1 SMP PREEMPT Debian 3.4.55-3linuxcnc 
i686 GNU/Linux

  $ cat /etc/udev/rules.d/90-xhc.rules
  # xhc-hb04 mpg pendant
  ATTR{idProduct}=="eb70", ATTR{idVendor}=="10ce", MODE="666", OWNER="root", 
GROUP="users"

as expected.
-------------------------------------------------------------------------

The error i see starting xhc-hb04 is:

[ 1.002037] [00001227] libusbx: error [op_open] libusbx couldn't open USB 
device /dev/bus/usb/007/002: Permission denied.
[ 1.002080] [00001227] libusbx: error [op_open] libusbx requires write access 
to USB device nodes.
-------------------------------------------------------------------------

looking at the permissions i see:
  $ ls -l /dev/bus/usb/007/002
  crw-rw-r-T 1 root users 189, 769 Aug  6 07:46 /dev/bus/usb/007/002
-------------------------------------------------------------------------
so MODE="666" was not honored

if i change with 
  $ sudo chmod 777 /dev/bus/usb/007/002, perms are ok
-------------------------------------------------------------------------
maybe this will help a debian packaging expert
-- 
Dewey Garrett


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