I added "acpi_backlight=vendor" to the grub parameters (/etc/default/grub). Fixes the backlight issue, in my Inspiron R14
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1177963/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
