kernel-packages team mailing list archive

[Romano Giannetti <romano.giannetti@xxxxxxxxx>]

Ok, (relatively) good news

1) still with kernel linux-
image-3.15.0-031500rc2-generic_3.15.0-031500rc2

2) I recompiled the input-wacom-0.20.0 that worked for me in 13.10, from
here: http://sourceforge.net/projects/linuxwacom/files/xf86-input-wacom
/input-wacom/input-wacom-0.20.0.tar.bz2/download

3) I substituted the module to the stock one, then rebooted;

4) the Oops is gone. So the problem must be in the changes from 0.20.0
and the current driver in the kernel, or in some modification of the
ubuntu kernel team. In the first case the bug should be easy to catch,
see the list of changes:

https://sourceforge.net/p/linuxwacom/input-
wacom/ci/2d38b3ce57d003cbef854674a4850e38f32f8c13/log/?path=

Will test now with 0.21.0 to check if the bug is there.

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

Title:
  Trusty Thar, 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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