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[Martin Flaska <flegy@xxxxxxxx>]

The same for me, xps13, full hd, booting from UEFI. Working well with
previous kernel version (3.8.0-29-generic). After updating to the latest
(3.8.0-30-generic) the problem is back again.

martin@flegy-nb:~$ uname -a
Linux flegy-nb 3.8.0-30-generic #44-Ubuntu SMP Thu Aug 22 20:52:24 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
martin@flegy-nb:~$ cat /etc/issue
Ubuntu 13.04 \n \l

When I am trying to change backlight (f4/f5) I see changes in

 /sys/class/backlight/intel_backlight/actual_brightness

but without any effect on the backlight

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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1169376

Title:
  8086:0166 [Dell XPS 13 L322X] backlight stopped working after update
  3.8.0-18.28

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

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
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /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)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  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
  RelatedPackageVersions:
   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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