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[LAva <1414789@xxxxxxxxxxxxxxxxxx>]

I think I fixed the problem by improving the slot_no_hotplug function in
/drivers/pci/hotplug/acpiphp_glue.c

As far as I can tell the radeon driver set the ignore_hotplug on my
radeon pci device, but the slot_no_hotplug function never got deep
enough to reach the pci device with this flag.

After I added the functionality to iterate through all the subordinate
pci devices, the function got to the flag and didn't remove my radeon
device after it was powered down by the radeon driver (which is the
expected behaviour).


** Patch added: "0001-Fixed-a-slot_no_hotplug-bug-in-acpiphp-system.patch"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1414789/+attachment/4324947/+files/0001-Fixed-a-slot_no_hotplug-bug-in-acpiphp-system.patch

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https://bugs.launchpad.net/bugs/1414789

Title:
  Kernel Oops - unable to handle kernel NULL pointer dereference at
  0000000000000010; EIP is at fb_release+0x26/0x60

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  My laptop has a kernel problem with the Ubuntu 15.04 live disk.

  The Kernel reports constantly about a NULL pointer reference.

  Sometimes the X-server starts without the Unity interface and the UI freezes constantly for a few seconds.
  It often ends with a complete freeze of the computer.

  Other times the computer freezes before the desktop was loaded.

  I think it could be the radeon driver for my ATI Mobility Radeon HD
  5650.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.18.0-9-generic 3.18.0-9.10
  ProcVersionSignature: Ubuntu 3.18.0-9.10-generic 3.18.2
  Uname: Linux 3.18.0-9-generic x86_64
  ApportVersion: 2.15.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D1p', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CasperVersion: 1.349
  Date: Mon Jan 26 21:52:58 2015
  LiveMediaBuild: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150126)
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: noprompt cdrom-detect/try-usb=true persistent file=/cdrom/preseed/username.seed boot=casper initrd=/casper/initrd.lz quiet splash -- BOOT_IMAGE=/casper/vmlinuz.efi
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.18.0-9-generic N/A
   linux-backports-modules-3.18.0-9-generic  N/A
   linux-firmware                            1.141
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/16/2011
  dmi.bios.vendor: INSYDE
  dmi.bios.version: V1.25
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: JM41_CP
  dmi.board.vendor: Acer
  dmi.board.version: Base Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Chassis Manufacturer
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnINSYDE:bvrV1.25:bd03/16/2011:svnAcer:pn:pvrV1.25:rvnAcer:rnJM41_CP:rvrBaseBoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion:
  dmi.product.version: V1.25
  dmi.sys.vendor: Acer

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