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[Bug 1258686] Re: [Dell Latitude D420] Faulty laptop battery or AC throws system cache for a loop


** Attachment added: "running fwts while the system is in it's funky state locks up the computer."

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  [Dell Latitude D420] Faulty laptop battery or AC throws system cache
  for a loop

Status in “linux” package in Ubuntu:

Bug description:
  After a random period of time after a fresh boot, the system cache
  gets corrupted. This is shown by hdparm -T.

  Before system cache corruption:
   Timing cached reads:   1804 MB in  2.00 seconds = 902.88 MB/sec

  After system cache corruption:
   Timing cached reads:   258 MB in  2.00 seconds = 129.10 MB/sec

  Either the system battery or the AC adaptor is not functioning
  correctly, the Dell bios at times indicates that the AC adaptor is not
  a valid Dell product, though it is. In any case, the battery does not
  charge, but remains at 0%.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-12-generic 3.11.0-12.19
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic i686
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: i386
   /dev/snd/controlC0:  asp        1931 F.... pulseaudio
  Date: Fri Dec  6 18:45:58 2013
  HibernationDevice: RESUME=UUID=08003f81-dc4b-4697-adb9-c4f28291be17
  InstallationDate: Installed on 2013-12-06 (0 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release i386 (20131016.1)
  MachineType: Dell Inc. Latitude D420
  MarkForUpload: True
   Socket 0:
     no product info available
   Socket 0:
     no card
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic root=UUID=ecd26c7d-0cb5-446e-a2ca-e4fefc0c0fd0 ro quiet splash processor.ignore_ppc=1 vt.handoff=7
   linux-restricted-modules-3.11.0-12-generic N/A
   linux-backports-modules-3.11.0-12-generic  N/A
   linux-firmware                             1.116
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/02/2008
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A06
  dmi.board.name: 0TJ984
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA06:bd02/02/2008:svnDellInc.:pnLatitudeD420:pvr:rvnDellInc.:rn0TJ984:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Latitude D420
  dmi.sys.vendor: Dell Inc.

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