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[md_5 <1382909@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Filed at Chris P's request, 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.

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.

Related Reports:
* https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1082244
* https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1072891
* https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1048141

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.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug trusty

-- 
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Packages, which is subscribed to linux in Ubuntu.
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:
  Filed at Chris P's request, 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.

  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.

  Related Reports:
  * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1082244
  * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1072891
  * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1048141

  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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