When I'd do a fresh install starting with 12.04 (that's when I got the laptop I'm using now) the backlight wouldn't work but it was just a simple solution by changing the GRUB line to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor". So when the time came to update to 12.10 it happened again and that was the solution again, but not with 13.04.
-- 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/1173961 Title: [Gateway NV55C] Two backlight interfaces that wont adjust backlight. Status in “linux” package in Ubuntu: Incomplete Bug description: I couldn't get the backlight to work after I upgraded to 13.04. WORKAROUND: The only grub lines that seem to work are these: GRUB_CMDLINE_LINUX="acpi_osi=Linux acpi_backlight=vendor" GRUB_CMDLINE_LINUX="acpi_osi=" I tried changing the grub parameters, and after several trys, nothing. I was asked to run grep . /sys/class/backlight/*/* and got the results of: maxo@Dayman:~$ grep . /sys/class/backlight/*/* /sys/class/backlight/acpi_video0/actual_brightness:9 /sys/class/backlight/acpi_video0/bl_power:0 /sys/class/backlight/acpi_video0/brightness:9 grep: /sys/class/backlight/acpi_video0/device: Is a directory /sys/class/backlight/acpi_video0/max_brightness:9 grep: /sys/class/backlight/acpi_video0/power: Is a directory grep: /sys/class/backlight/acpi_video0/subsystem: Is a directory /sys/class/backlight/acpi_video0/type:firmware /sys/class/backlight/intel_backlight/actual_brightness:976 /sys/class/backlight/intel_backlight/bl_power:0 /sys/class/backlight/intel_backlight/brightness:976 grep: /sys/class/backlight/intel_backlight/device: Is a directory /sys/class/backlight/intel_backlight/max_brightness:976 grep: /sys/class/backlight/intel_backlight/power: Is a directory grep: /sys/class/backlight/intel_backlight/subsystem: Is a directory /sys/class/backlight/intel_backlight/type:raw But using the Fn Keys, you can only adjust it a little, like from full brightness to about half. To add something else, with the other parameters when I adjust with the Fn Keys, the brightness bubble you get on the top right of your screen doesn't appear. ProblemType: Bug DistroRelease: Ubuntu 13.04 Package: linux-image-3.8.0-19-generic 3.8.0-19.29 [modified: boot/vmlinuz-3.8.0-19-generic] ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8 Uname: Linux 3.8.0-19-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.9.2-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: maxo 2482 F.... pulseaudio Date: Sun Apr 28 07:01:21 2013 HibernationDevice: RESUME=UUID=f71ed279-badf-446b-afc6-d5a75316ec0a InstallationDate: Installed on 2013-04-25 (2 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) MachineType: Gateway NV55C MarkForUpload: True 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-3.8.0-19-generic root=UUID=bc22ba4b-fcd9-46f3-b10a-11477dd4f618 ro acpi_osi= acpi_backlight=vendor quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.8.0-19-generic N/A linux-backports-modules-3.8.0-19-generic N/A linux-firmware 1.106 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 08/10/2011 dmi.bios.vendor: Gateway dmi.bios.version: V1.24 dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: NV55C dmi.board.vendor: Gateway dmi.board.version: V1.24 dmi.chassis.type: 10 dmi.chassis.vendor: Gateway dmi.chassis.version: V1.24 dmi.modalias: dmi:bvnGateway:bvrV1.24:bd08/10/2011:svnGateway:pnNV55C:pvrV1.24:rvnGateway:rnNV55C:rvrV1.24:cvnGateway:ct10:cvrV1.24: dmi.product.name: NV55C dmi.product.version: V1.24 dmi.sys.vendor: Gateway To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1173961/+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
