I tried
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor
i915.invert_brightness=1"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux
acpi_backlight=vendor i915.invert_brightness=1"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=nomodeset
acpi_backlight=vendor i915.invert_brightness=1"

All give me the same lower screen resolution (1024 x 768) instead of the
one I used to have (1366 x 768). Changing brightness does not work and
using Alt-Tab reminds me of Windows 3.1.

Merci,

Gilbert



2012/12/8 Kangarooo <email address hidden>

> Did you really tryd changing brightness when comp has loaded? Using
> FN+Right/Left arrow? In all 3 variations?
>
> --
> You received this bug notification because you are subscribed to a
> duplicate bug report (934707).
> https://bugs.launchpad.net/bugs/765438
>
> Title:
>   On startup, the backlight is off on laptop
>
> Status in The Linux Kernel:
>   Confirmed
> Status in “linux” package in Ubuntu:
>   Triaged
> Status in “linux” package in Fedora:
>   New
>
> Bug description:
>   When Ubuntu starts up, the back-light is off on my laptop.  I can plug
>   it into an external monitor and the display is fine.  I can easily
>   turn the back-light on with "sudo setpci -s 00:02.0 F4.B=[HEX]" where
>   00 is the brightest and FF is off.  In past distributions, the GUI-
>   based brightness utilities did not work and I used this command to
>   change by back-light brightness.  I know that there are many people
>   who can not use back-light GUI-utilities on the past distributions as
>   well.  This issue also occurs if I close my screen and raise it again.
>
>   This issue also effected the installation process as well as when I
>   was using the i686 installer.
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 11.04
>   Package: xorg 1:7.6+4ubuntu3
>   ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
>   Uname: Linux 2.6.38-8-generic x86_64
>   Architecture: amd64
>   CompizPlugins:
> [core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,staticswitcher,resize,fade,unitymtgrabhandles,scale,session,unityshell]
>   CompositorRunning: compiz
>   CurrentDmesg:
>    [   29.430043] eth0: no IPv6 routers present
>    [   30.988586] EXT4-fs (sda7): re-mounted. Opts:
> errors=remount-ro,commit=0
>   DRM.card0.DP.1:
>    status: disconnected
>    enabled: disabled
>    dpms: Off
>    modes:
>    edid-base64:
>   DRM.card0.LVDS.1:
>    status: connected
>    enabled: enabled
>    dpms: On
>    modes: 1366x768
>    edid-base64:
> AP///////wANr5kVAAAAAAcUAQOAIhN4Cj2VlFZPjigmUFQAAAABAQEBAQEBAQEBAQEBAQEBeh1W0lAAHjA8KDYAWMEQAAAYAAAA/gBOMTU2QjMtTDBCCiAgAAAA/gBDTU8KICAgICAgICAgAAAA/gBOMTU2QjMtTDBCCiAgAEg=
>   DRM.card0.VGA.1:
>    status: disconnected
>    enabled: disabled
>    dpms: Off
>    modes:
>    edid-base64:
>   Date: Mon Apr 18 21:34:59 2011
>   DistUpgraded: Fresh install
>   DistroCodename: natty
>   DistroVariant: ubuntu
>   GdmLog1:
>
>   GdmLog2:
>
>   GraphicsCard:
>    Intel Corporation Mobile 4 Series Chipset Integrated Graphics
> Controller [8086:2a42] (rev 09) (prog-if 00 [VGA controller])
>      Subsystem: Acer Incorporated [ALI] Device [1025:0459]
>      Subsystem: Acer Incorporated [ALI] Device [1025:0459]
>   InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110413)
>   MachineType: eMachines eMachines E527
>   ProcEnviron:
>    LANGUAGE=en_US:en
>    LANG=en_US.UTF-8
>    SHELL=/bin/bash
>   ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic
> root=UUID=83376c0e-9440-4ba9-bbdb-363565bf5e72 ro quiet splash vt.handoff=7
>   Renderer: Unknown
>   SourcePackage: xorg
>   Symptom: display
>   UpgradeStatus: No upgrade log present (probably fresh install)
>   dmi.bios.date: 04/16/2010
>   dmi.bios.vendor: eMachines
>   dmi.bios.version: V1.01
>   dmi.board.asset.tag: Base Board Asset Tag
>   dmi.board.name: eMachines E527
>   dmi.board.vendor: eMachines
>   dmi.board.version: V1.01
>   dmi.chassis.type: 10
>   dmi.chassis.vendor: eMachines
>   dmi.chassis.version: V1.01
>   dmi.modalias:
> dmi:bvneMachines:bvrV1.01:bd04/16/2010:svneMachines:pneMachinesE527:pvrV1.01:rvneMachines:rneMachinesE527:rvrV1.01:cvneMachines:ct10:cvrV1.01:
>   dmi.product.name: eMachines E527
>   dmi.product.version: V1.01
>   dmi.sys.vendor: eMachines
>   version.compiz: compiz 1:0.9.4+bzr20110411-0ubuntu1
>   version.ia32-libs: ia32-libs 20090808ubuntu12
>   version.libdrm2: libdrm2 2.4.23-1ubuntu6
>   version.libgl1-mesa-dri: libgl1-mesa-dri 7.10.2-0ubuntu1
>   version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
>   version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.2-0ubuntu1
>   version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu3
>   version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4
>   version.xserver-xorg-video-intel: xserver-xorg-video-intel
> 2:2.14.0-4ubuntu7
>   version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau
> 1:0.0.16+git20110107+b795ca6e-0ubuntu7
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/linux/+bug/765438/+subscriptions
>