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[TJ <ubuntu@xxxxxx>]

Currently testing with the v4.2 from wily-proposed with additional
patches for:

PCI: check pref compatible bit for mem64 resource of pcie device
PCI: get new realloc size for bridge that does not have children
workqueue: Make flush_workqueue() available again to non GPL modules

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https://bugs.launchpad.net/bugs/1490551

Title:
  Wily: hidinput_disconnect BUG: unable to handle kernel NULL pointer
  derefernce at (null)

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  15.10 amd64, kernel BUG when a Bluetooth mouse disconnected due to
  battery failure - in other words, an uncommanded disconnect.

  $ uname -a
  Linux hephaestion.lan.iam.tj 4.1.0-3-lowlatency #3-Ubuntu SMP PREEMPT Tue Jul 28 13:11:08 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

  Log attached:

  $ journalctl  -n 48 | awk '{$1="";$2="";$4="";print $0}'
  --- 
  ApportVersion: 2.18-0ubuntu7
  Architecture: amd64
  AudioDevicesInUse:
   USER PID ACCESS COMMAND
   /dev/snd/controlC0:  tj         1733 F.... pulseaudio
  CRDA: N/A
  CurrentDesktop: LXDE
  DistroRelease: Ubuntu 15.10
  EcryptfsInUse: Yes
  MachineType: Dell Inc. XPS M1530
  NonfreeKernelModules: nvidia
  Package: linux (not installed)
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.1.0-3-lowlatency root=/dev/mapper/VG_OS-ubuntu_14.04_rootfs ro debug
  ProcVersionSignature: Ubuntu 4.1.0-3.3-lowlatency 4.1.3
  RelatedPackageVersions:
   linux-restricted-modules-4.1.0-3-lowlatency N/A
   linux-backports-modules-4.1.0-3-lowlatency  N/A
   linux-firmware                              1.147
  Tags:  wily
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  Uname: Linux 4.1.0-3-lowlatency x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm sudo
  _MarkForUpload: True
  dmi.bios.date: 11/19/2008
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A12
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA12:bd11/19/2008:svnDellInc.:pnXPSM1530:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: XPS M1530
  dmi.sys.vendor: Dell Inc.

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