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[Kenneth Bogert <1310800@xxxxxxxxxxxxxxxxxx>]

I can reliably trigger this bug  on my machine in the 3.16 and 3.13
kernels.  I've attached the kernel crash output for 3.16 (minus the dump
because of its size, I can provide a link if desired).

Adding wacom to /etc/modules prevents this bug for me.

** Attachment added: "linux-image-3.16.0-31-generic_crash.tar.gz"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1310800/+attachment/4343792/+files/linux-image-3.16.0-31-generic_crash.tar.gz

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https://bugs.launchpad.net/bugs/1310800

Title:
  056a:0302 Trusty Tahr, kernel 3.13: automatic load of wacom.ko driver
  cause a "hard" kernel panic

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I have just upgraded to 14.04 from 13.10.

  I have a wacom cth-480  touch+pen tablet, which was not recognized on
  13.10 (kernel 3.11). With the stock kernel from 14.04, I have an
  immediate kernel panic as soon as I plug in the tablet to the laptop.

  The system is a asus 1005PE (32 bit install), Xubuntu, up-to date:
  Linux asus-romano 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:08:14
  UTC 2014 i686 i686 i686 GNU/Linux

  The really strange thing is that if I manually load the driver with
  `sudo modprobe wacom` *before* pluggin the tablet in, then the tablet
  is recognized and works ok:

  SYS: Apr 21 15:15:47 asus-romano kernel: [  265.664161] usbcore: registered new interface driver wacom
  SYS: Apr 21 15:15:52 asus-romano kernel: [  270.088161] usb 2-1: new full-speed USB device number 2 using uhci_hcd
  SYS: Apr 21 15:15:52 asus-romano kernel: [  270.253626] usb 2-1: New USB device found, idVendor=056a, idProduct=0302
  SYS: Apr 21 15:15:52 asus-romano kernel: [  270.253641] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
  SYS: Apr 21 15:15:52 asus-romano kernel: [  270.253651] usb 2-1: Product: Intuos PTS
  SYS: Apr 21 15:15:52 asus-romano kernel: [  270.253659] usb 2-1: Manufacturer: Wacom Co.,Ltd.
  SYS: Apr 21 15:15:52 asus-romano kernel: [  270.257027] input: Wacom Intuos PT S Pen as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1:1.0/input/input14
  SYS: Apr 21 15:15:52 asus-romano kernel: [  270.260630] input: Wacom Intuos PT S Finger as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1:1.1/input/input15
  SYS: Apr 21 15:15:52 asus-romano mtp-probe: checking bus 2, device 2: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1"
  SYS: Apr 21 15:15:52 asus-romano mtp-probe: bus: 2, device: 2 was not an MTP device

  A screenshot of the kernel panic is added. I can reproduce it at will.

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