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[Matteo Panella <morpheus@xxxxxxxxxxx>]

Tested on 3.17-rc5-utopic as instructed, I observed the same behaviour:
all reset methods except writing to CF9 result in the system getting
stuck after the kernel issues the "Restarting System" message, then the
machine powers down suddenly.

Resetting via CF9 still results in disks going into emergency head park
before the system restarts, so it's still a reset method I'd *really*
wish to avoid.

** Tags added: kernel-bug-exists-upstream kernel-bug-exists-
upstream-3.17-rc5

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1371911

Title:
  [Dell L702X] Reboot fails with all methods except write to CF9

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  All reset methods on a fully updated L702X with BIOS A19 (latest available release) fail except for the PCI reset through CF9.
  This is a regression from the 12.04 LTS kernel, and other OSes (namely, Windows 7) can reboot without problems.

  The problem with writing to CF9 is that one of the disks (or both)
  perform an emergency head parking before the system resets itself, so
  while the system reboots it's less than optimal.

  I'm attaching both the disassembled DSDT and the fwts result log
  (which itself is inconsistent, since the CPU is running the latest
  microcode).

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-35-generic 3.13.0-35.62
  ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
  Uname: Linux 3.13.0-35-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  panella    2843 F.... pulseaudio
                        panella    3347 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Sat Sep 20 14:34:28 2014
  HibernationDevice: RESUME=UUID=7f975fef-305d-4bc7-b61f-3c3efe006fca
  InstallationDate: Installed on 2012-04-28 (874 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MachineType: Dell Inc. Dell System XPS L702X
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-35-generic root=UUID=d914b486-cf0a-465b-9b10-260738eba9a3 ro reboot=p intel_pstate=enable
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-35-generic N/A
   linux-backports-modules-3.13.0-35-generic  N/A
   linux-firmware                             1.127.6
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-09-19 (0 days ago)
  dmi.bios.date: 09/07/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A19
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 0XN71K
  dmi.board.vendor: Dell Inc.
  dmi.board.version: FAB1
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA19:bd09/07/2012:svnDellInc.:pnDellSystemXPSL702X:pvr:rvnDellInc.:rn0XN71K:rvrFAB1:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L702X
  dmi.sys.vendor: Dell Inc.

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