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[Bug 1177963] Re: Backlight switches of on Ubuntu 13.04 boot-screen - Dell XPS12

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Alejandro Arcos <arcosaf@xxxxxxxxx>
Date: Sat, 03 Aug 2013 17:00:00 -0000
Reply-to: Bug 1177963 <1177963@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

I added "acpi_backlight=vendor" to the grub parameters
(/etc/default/grub). Fixes the backlight issue, in my Inspiron R14

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https://bugs.launchpad.net/bugs/1177963

Title:
  Backlight switches of on Ubuntu 13.04 boot-screen - Dell XPS12

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Hello

  I have a Dell XPS12 and the problem that the backlight gets turned off on the Ubuntu 13.04 boot-screen.
  The system starts up normally, at the grub menu the brightness is normal and as soon as the Ubuntu boot-screen appears the brightness is set to minimal level (what unfortunately means completely turned off).
  The hot-keys work, so that I can immediately adjust the brightness and log in to the system - but it is very annoying.
  I tested 3.8.18, 3.8.19, 3.8.20 as well as mainline 3.9.0 and 3.9.1 kernel but the bug persists. Or could it be a bug in the grub config?

  Please let me know what log or config files may be helpful.

  Thanks in advance

  grub file:
  # If you change this file, run 'update-grub' afterwards to update
  # /boot/grub/grub.cfg.
  # For full documentation of the options in this file, see:
  #   info -f grub -n 'Simple configuration'

  GRUB_DEFAULT=0
  GRUB_HIDDEN_TIMEOUT=0
  GRUB_HIDDEN_TIMEOUT_QUIET=true
  GRUB_TIMEOUT=10
  GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
  GRUB_CMDLINE_LINUX=""
  --- 
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: amd64
  DistroRelease: Ubuntu 13.04
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2013-04-26 (12 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MarkForUpload: True
  Package: linux (not installed)
  Tags:  raring
  Uname: Linux 3.9.1-030901-generic x86_64
  UnreportableReason: The running kernel is not an Ubuntu kernel
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dialout dip lpadmin netdev plugdev sambashare scanner sudo vboxusers

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