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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
precise' to 'verification-done-precise'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-precise

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https://bugs.launchpad.net/bugs/1162026

Title:
  backlight not adjustable after screen turns off and then back on

Status in Dell Sputnik:
  Fix Released
Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Raring:
  Fix Released

Bug description:
  On both versions of the XPS 13 (L322X and L321X) running Ubuntu Raring with the latest 3.8 kernel, letting the screen turn off and then back on causes the backlight to go to maximum brightness and become not adjustable. This behavior is not seen with suspend/resume or at boot (such as with LP #954661). However, like with those issues, "/bin/echo 0 > /sys/class/backlight/intel_backlight/brightness" allows the backlight to become adjustable again. I have verified this behavior on two systems. The backlight behaved correctly on both with Precise running Kamal's special kernel build.
  ---
  ApportVersion: 2.9.2-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/hwC0D3', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D3p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-precise-amd64-20120703-2
  DistroRelease: Ubuntu 13.04
  HibernationDevice: RESUME=UUID=2827209a-01af-48d1-82e8-472354ab65a7
  InstallationDate: Installed on 2013-03-26 (3 days ago)
  InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20120703-15:08
  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=/boot/vmlinuz-3.8.0-15-generic root=UUID=5c924dca-ecf4-4d3d-a7d2-34780269b9c5 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.8.0-15.25-generic 3.8.4
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-15-generic N/A
   linux-backports-modules-3.8.0-15-generic  N/A
   linux-firmware                            1.104
  Tags:  raring
  Uname: Linux 3.8.0-15-generic x86_64
  UpgradeStatus: Upgraded to raring on 2013-03-29 (0 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 02/21/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: B40
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrB40:bd02/21/2013:svnDellInc.:pnDellSystemXPSL322X:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L322X
  dmi.sys.vendor: Dell Inc.

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