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[Karl Hunt <karlgeorgehunt@xxxxxxxxx>]

To add to my previous comment:

However if I log out again without the battery or cord then plug it back
in whilst on the login screen it locks up immediately.

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https://bugs.launchpad.net/bugs/1217367

Title:
  E5420 Laptop freezes whilst charging and below 90% battery (approx)
  13.04 12.04 10.04

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  My Dell Latitude E5420 hangs when the power cord is in and the battery
  is charging and below 90%. This bug has existed in 10.04 and every
  version since. There used to be a work around:

  echo N> /sys/module/drm_kms_helper/parameters/poll

  but this no longer works in raring ringtail. Also before 13.04 I was
  able to still barely use the system and perform the above command but
  now the system locks up entirely until the batter is removed.

  I am currently using an up to date ringtail installation.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.8.0-29-generic 3.8.0-29.42
  ProcVersionSignature: Ubuntu 3.8.0-29.42-generic 3.8.13.5
  Uname: Linux 3.8.0-29-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  karlhunt   2195 F.... pulseaudio
  CRDA:
   country GB:
   	(2402 - 2482 @ 40), (N/A, 20)
   	(5170 - 5250 @ 40), (N/A, 20)
   	(5250 - 5330 @ 40), (N/A, 20), DFS
   	(5490 - 5710 @ 40), (N/A, 27), DFS
  Date: Tue Aug 27 14:29:46 2013
  HibernationDevice: RESUME=UUID=8e3061b3-2966-432b-afcc-f8e5b61c4dde
  InstallationDate: Installed on 2013-06-21 (67 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  Lsusb:
   Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 005: ID 093a:2510 Pixart Imaging, Inc. Optical Mouse
  MachineType: Dell Inc. Latitude E5420
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-29-generic root=UUID=e2a067db-5091-4705-b366-5010191aa820 ro persistent quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-29-generic N/A
   linux-backports-modules-3.8.0-29-generic  N/A
   linux-firmware                            1.106
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/20/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A01
  dmi.board.name: 0H5TG2
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA01:bd04/20/2011:svnDellInc.:pnLatitudeE5420:pvr01:rvnDellInc.:rn0H5TG2:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E5420
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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