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[md_5 <1382909@xxxxxxxxxxxxxxxxxx>]

The following commit resolves this issue:
https://github.com/torvalds/linux/commit/0b8db271f1592e118feef7300f6da85bea9366da

It applies cleanly to 3.17.1, backported from 3.18RC1.

Thanks

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

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https://bugs.launchpad.net/bugs/1382909

Title:
  Dell XPS 15Z Requires Kernel Parameters to Boot Correctly

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  This bug is still present on both the Ubuntu 14.04 kernel (3.13) as
  well as the latest mainline kernel (3.17). In addition the mainline
  kernel causes additional issues with regards to brightness control.

  WORKAROUND: I have used the boot param noapic to run Ubuntu on this
  laptop since 12.04, however acpi=off, acpi=noirq or
  acpi_backlight=vendor dell_laptop.backlight=0 all also fix the issue.
  Using the last option however causes poor brightness control as the
  dell backlight driver is not properly optimized.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-37-generic 3.13.0-37.64
  ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
  Uname: Linux 3.13.0-37-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  michael    2066 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun Oct 19 15:50:18 2014
  HibernationDevice: RESUME=UUID=79996bc0-bea3-4008-9182-e2afa0585224
  InstallationDate: Installed on 2014-01-31 (260 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: Dell Inc. Dell System XPS 15Z
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-37-generic root=UUID=4c859e77-4949-474c-9531-c6da9ef27187 ro noapic quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-37-generic N/A
   linux-backports-modules-3.13.0-37-generic  N/A
   linux-firmware                             1.127.7
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-04-16 (185 days ago)
  dmi.bios.date: 09/07/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A12
  dmi.board.name: 060G42
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA12:bd09/07/2012:svnDellInc.:pnDellSystemXPS15Z:pvr:rvnDellInc.:rn060G42:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS 15Z
  dmi.sys.vendor: Dell Inc.

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