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[Bug 1163720] Re: Brightness control broken on XPS13 and 3.8.0-16, 3.8.0-22 and 3.11.0-12


XPS13-with-UEFI users, please take note and try the following:

The Ubuntu -proposed kernels now allow you to set a new boot parameter
"i915.disable_pch_pwm=0" which should correct the black screen on boot
problem, and may enable backlight control functionality after boot.
However, the boot parameter is NOT enabled by default (since it would
adversely affect non-UEFI configurations).  The boot parameter is only
relevant for Dell XPS13's.  See comment #77 for additional information.

The "i915.disable-pch_pwm=0" boot parameter is available as of these
kernel versions:

  Saucy 3.11.0-15 #22
  Raring 3.8.0-35 #50
  Quantal 3.5.0-45 #68
  Precise 3.2.0-58 #88

See this page for instructions about using boot parameters:

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  Brightness control broken on XPS13 and 3.8.0-16, 3.8.0-22 and

Status in The Linux Kernel:
Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Precise:
  Fix Committed
Status in “linux” source package in Quantal:
  Fix Committed
Status in “linux” source package in Raring:
  Fix Committed
Status in “linux” source package in Saucy:
  Fix Committed

Bug description:
  Since 3.8.0-16, the brightness control doesn’t work anymore.
  The popup is displayed, so the shortcut keys do work correctly, but it has no effect on the actual brightness of the screen.

  Switching back to 3.8.0-15 solves the issue.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.8.0-16-generic 3.8.0-16.26
  ProcVersionSignature: Ubuntu 3.8.0-16.26-generic 3.8.5
  Uname: Linux 3.8.0-16-generic x86_64
  ApportVersion: 2.9.2-0ubuntu5
  Architecture: amd64
   /dev/snd/controlC0:  coucouf    1837 F.... pulseaudio
  Date: Wed Apr  3 08:29:58 2013
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
  HibernationDevice: RESUME=UUID=e49e9eae-f16f-45bb-ad2c-b6da5c0c6f6d
  InstallationDate: Installed on 2013-03-23 (10 days ago)
  InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20120703-15:08
  MachineType: Dell Inc. Dell System XPS L322X
  MarkForUpload: True
   PATH=(custom, no user)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-16-generic root=UUID=3f6858e1-d8f5-44c4-b8e9-5ab8b9639ba7 ro quiet splash vt.handoff=7
   linux-restricted-modules-3.8.0-16-generic N/A
   linux-backports-modules-3.8.0-16-generic  N/A
   linux-firmware                            1.104
  SourcePackage: linux
  UpgradeStatus: Upgraded to raring on 2013-04-02 (0 days ago)
  dmi.bios.date: 01/22/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A07
  dmi.board.name: 0PJHXN
  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.:bvrA07:bd01/22/2013:svnDellInc.:pnDellSystemXPSL322X:pvr:rvnDellInc.:rn0PJHXN:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L322X
  dmi.sys.vendor: Dell Inc.

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