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[Bug 1169376] Re: XPS13 backlight stopped working after update 3.8.0-18.28


A patch is being worked on to fix this once and for all.   We got an FHD
system into the hands of someone to hammer all of this out.

There is some upstream ACPI stuff that needs to settle first, but, this
should be happening very soon if not already.   Once that's done the
13.10 development release will pick this up first, followed by a
backport to 13.04.

3.8.0-27 doesn't  have any fixes in it yet.

I don't have an exact ETA on when all of this will be pushed out right
but it will be soon.

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  XPS13 backlight stopped working after update 3.8.0-18.28

Status in Dell Sputnik:
Status in “linux” package in Ubuntu:

Bug description:
  I'm on 13.04 beta 2 and I've been updating daily. After today's
  update, I was asked to restart and, after the restart, the backlight
  stopped working. What's worse is that the backlight is stuck in the
  lowest possible setting. I can barely see enough to type out this bug
  report. This is not a hardware problem. When I restart the computer
  the backlight turns on property  but burns off when the Ubuntu
  encryption screen comes up (I'm using full disk encryption). Please
  fix this as soon as possible.

  XPS 13 version: L322x
  Display version: FHD (1080p)
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: amd64
   /dev/snd/controlC0:  cr45h      1901 F.... pulseaudio
  DistroRelease: Ubuntu 13.04
  HibernationDevice: RESUME=UUID=a5d2ab8b-a068-4a69-95a6-b4e955b290f5
  InstallationDate: Installed on 2013-04-08 (9 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130402.1)
  MachineType: Dell Inc. Dell System XPS L322X
  MarkForUpload: True
  Package: linux (not installed)
   PATH=(custom, no user)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-18-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.8.0-18.28-generic 3.8.6
   linux-restricted-modules-3.8.0-18-generic N/A
   linux-backports-modules-3.8.0-18-generic  N/A
   linux-firmware                            1.105
  Tags:  raring
  Uname: Linux 3.8.0-18-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  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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