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[Jacob Nevins <1310800@xxxxxxxxxxxxxxxxxx>]

For completeness, here's my panic, transcribed manually from my netbook
(there may be typos). (Not sure how useful this will be since it's not
the whole backtrace.)

...
[  178.020018]  [<c14c5581>] ? uhci_free_td+0xb1/0xd0
[  178.020018]  [<c14c6ce3>] uhci_scan_schedule+0x333/0x8d0
[  178.020018]  [<c14c7317>] uhci_irq+0x97/0x140
[  178.020018]  [<c14a1661>] usb_hcd_irq+0x21/0x30
[  178.020018]  [<c10a5ba5>] handle_irq_event_percpu+0x35/0x1a0
[  178.020018]  [<c10a5d41>] handle_irq_event+0x31/0x50
[  178.020018]  [<c10a8660>] ? unmask_irq+0x30/0x30
[  178.020018]  [<c10a86ae>] handle_fasteoi_irq+0x4e/0xe0
[  178.020018]  <IRQ>
[  178.020018]  [<c165a26c>] ? do_IRQ+0x3c/0xb0
[  178.020018]  [<c165a033>] ? common_interrupt+0x33/0x38
[  178.020018]  [<c13120ea>] ? mpihelp_submul_1+0x5a/0xc0
[  178.020018]  [<c1312ad7>] ? mpihelp_divrem+0x207/0x6f0
[  178.020018]  [<c13140fc>] ? mpi_powm+0x41c/0x890
[  178.020018]  [<c12c0e48>] ? RSA_verify_signature+0xb8/0x220
[  178.020018]  [<c12c0d90>] ? public_key_describe+0x40/0x40
[  178.020018]  [<c12c0cea>] ? public_key_verify_signature+0x9a/0xe0
[  178.020018]  [<c1314637>] ? mpi_alloc+0x57/0x80
[  178.020018]  [<c131230d>] ? mpi_read_raw_data+0x6d/0x110
[  178.020018]  [<c12c0d40>] ? public_key_read_verify_signature_2+0x10/0x20
[  178.020018]  [<c12c0bf7>] ? verify_signature+0x27/0x40
[  178.020018]  [<c10c50ab>] ? mod_verify_sig+0x29b/0x390
[  178.020018]  [<c10c2f33>] ? load_module+0x1b3/0x18e0
[  178.020018]  [<c1176774>] ? vfs_read+0xd4/0x140
[  178.020018]  [<c117b4c5>] ? kernel_read+0x35/0x50
[  178.020018]  [<c10c0c39>] ? copy_module_from_fd.isra.45+0xf9/0x190
[  178.020018]  [<c12a81a4>] ? aa_label_find_merge+0xf4/0x390
[  178.020018]  [<c10c47c5>] ? SyS_finit_module+0x75/0xc0
[  178.020018]  [<c11396db>] ? vm_mmap_pgoff+0x7b/0xa0
[  178.020018]  [<c1659b4d>] ? sysenter_do_call+0x12/0x28
[  178.020018] Code: ff 8d b4 26 00 00 00 00 55 89 e5 57 56 53 83 ec 0c 3e 8d 74 26 00 83 fa 1f 89 c3 76 0b 83 c4 0c 5b 5e 5f 5d c3 8d 76 00 89 4d ec <0f> a3 50 18 19 c0 85 c0 89 55 f0 74 e5 8d b3 8c 01 00 00 89 f0
[  178.020018] EIP: [<c14e6863>] input_event+0x23/0x70 SS:ESP 0068:f4c09dfc
[  178.020018] CR2: 0000000000000018
[  178.020018] Kernel panic - not syncing: Fatal exception in interrupt
[  178.020018] drm_kms_helper: panic occurred, switching back to text console

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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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