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[Jacob Nevins <1310800@xxxxxxxxxxxxxxxxxx>]

I also have a recent Wacom tablet (CTH-480S, USB 056a:0302) and can
reproduce a kernel panic with a freshly downloaded Xubuntu 14.04 i386
installation image running off a USB stick on my 32-bit netbook -- boot
Xubuntu, plug the tablet in, and boom. So this is a real problem with
the Trusty kernel on the installation media, regardless of whether it
exists in newer upstream kernels (for which the situation seems
confused).

The Ubuntu kernel team backported support for this range of tablets to
the Trusty kernel by cherry-picks at (I believe) my instigation --
support for them only appeared upstream from 3.14, but a conversation on
IRC resulted in the backported support (so I feel slightly responsible).

So, it's possible that this is an Ubuntu-specific problem related to the
backport -- maybe not enough changes were backported? I did test some
daily pre-release images (on amd64) and they worked for me fine then;
this is the first time I've tried the final release.

(I haven't upgraded my amd64 machine to 14.04 yet; I'm still on 12.04,
and with that I'm happily using the tablet with my own hand-rolled
input-wacom 0.20.0 DKMS package. I haven't yet tried the amd64
installation image to see if I can get a panic out of it.)

I'm happy to gather further diagnostic information as necessary to
resolve this issue in Trusty.

** Summary changed:

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

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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:
  Incomplete

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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