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same problem here with a MEDION MD 96500 Notebook. wistron_btns causes a
segfault and as a result the machine won't shut down.

A fix has been posted several times to LKML and it is really hard to understand 
why it is ignored.

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  wistron_btns module possible BUG on FJ AMILO Pro V3505.

Status in linux package in Ubuntu:

Bug description:
  I'm a new Ubuntu user, trying to understand why I consistently get
  this BUG message

  Oct 14 19:57:37 belia kernel: [  729.873790] wistron_btns: BIOS signature 
found at c00f5b10, entry point 000FDD20
  Oct 14 19:57:37 belia kernel: [  729.873966] BUG: unable to handle kernel 
paging request at c00fdd20
  Oct 14 19:57:37 belia kernel: [  729.874050] IP: [<c00fdd20>] 0xc00fdd20
  Oct 14 19:57:37 belia kernel: [  729.874095] *pdpt = 0000000001c7b001 *pde = 
0000000001d43063 *pte = 80000000000fd163
  Oct 14 19:57:37 belia kernel: [  729.874186] Oops: 0011 [#1] SMP
  Oct 14 19:57:37 belia kernel: [  729.876007] Hardware name: FUJITSU SIEMENS 
AMILO Pro Edition V3505        /AMILO Pro Edition V3505        , BIOS R01-B0G   

  from the wistron_btns kernel module, used on FJ AMILO Pro V3505, to enable
  and disable the wireless card module from the notebook function button.

  The same BUG arise on all the recent kernels, including the one I'm reporting
  about, even at installation time from the Ubuntu media, at module "load time".

  By the way, once the kernel report this OOps, the system doesn't power
  off or reboot correctly at shutdown time, it simply hangs, even when
  installing the system from the media, a really serious issue for new,
  naive users.

  The only way to solve the problem seems to "blacklist" the module in
  /etc/modprobe.d/blacklist,conf, but, unfortunately, this will "LOCK"
  the wireless module in its enabled or disables state and require to
  boot a different kernel to unlock its state.

  I did some investigation on the Net about this issue and I found an
  interesting report about this problem, that seems known at least from
  kernel version 3.12,

  I tested the suggested patch against the
  linux/drivers/input/misc/wistron_btns.c gentoo 4.4.21 source, my main
  system, and, well, it correct the BUG, not anymore any Oops and the
  button seems to work correctly.

  You will find the patch I applied to the wistron_btns.c source as an
  attachment to this report: it is a really simple patch that I'm almost
  sure (I didn't verified it) it may be applied unchanged to the
  4.4.0-43-generic Ubuntu kernel image sources.

  G. Vitillaro.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-43.63-generic 4.4.21
  Uname: Linux 4.4.0-43-generic i686
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: i386
  CompizPlugins: No value set for 
  CompositorRunning: None
  CurrentDesktop: KDE
  Date: Sat Oct 15 12:20:12 2016
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: kubuntu
  ExtraDebuggingInterest: No
   Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics 
Controller [8086:27a2] (rev 03) (prog-if 00 [VGA controller])
     Subsystem: Fujitsu Technology Solutions Mobile 945GM/GMS, 943/940GML 
Express Integrated Graphics Controller [1734:10c1]
     Subsystem: Fujitsu Technology Solutions Mobile 945GM/GMS/GME, 943/940GML 
Express Integrated Graphics Controller [1734:10c1]
  InstallationDate: Installed on 2016-09-29 (15 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release i386 (20160719)
  MachineType: FUJITSU SIEMENS AMILO Pro Edition V3505
   Socket 0:
     no product info available
   Socket 0:
     no card
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-43-generic 
root=UUID=201692f6-1f2c-4b27-b9b7-172d8305a2f0 ro splash quiet vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install) 04/27/2007
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: R01-B0G AMILO Pro Edition V3505
  dmi.board.vendor: FUJITSU SIEMENS
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: 221C8340FC5C11DAA7BA90D491D4809D
  dmi.chassis.type: 10
  dmi.chassis.vendor: FUJITSU SIEMENS
  dmi.chassis.version: A2040
dmi:bvnPhoenixTechnologiesLTD:bvrR01-B0G:bd04/27/2007:svnFUJITSUSIEMENS:pnAMILOProEditionV3505:pvr20:rvnFUJITSUSIEMENS:rnAMILOProEditionV3505:rvrNotApplicable:cvnFUJITSUSIEMENS:ct10:cvrA2040: AMILO Pro Edition V3505
  dmi.product.version: 20
  dmi.sys.vendor: FUJITSU SIEMENS
  version.compiz: compiz 1:
  version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.2
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2.2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2.2
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
  xserver.bootTime: Sat Oct 15 10:48:04 2016
  xserver.configfile: default
   input        Power Button         KEYBOARD, id 6
   input        Video Bus            KEYBOARD, id 7
   input        Sleep Button         KEYBOARD, id 8
   input        AT Translated Set 2 keyboard KEYBOARD, id 9
   input        SynPS/2 Synaptics TouchPad TOUCHPAD, id 10
   /dev/dri/card0: failed to set DRM interface version 1.4: Permission denied
   /dev/dri/card0: failed to set DRM interface version 1.4: Permission denied
  xserver.logfile: /var/log/Xorg.0.log
   product id                                5040 
   vendor                                     CPT
  xserver.version: 2:1.18.4-0ubuntu0.1

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