/sys/class/backlight/ empty back-light control unavailable.

[aaron]

# no backlight or video directories here. No back-light control.

ll -a /sys/class/backlight/
total 0
drwxr-xr-x 2 root root 0 Nov 29 12:24 ./
drwxr-xr-x 51 root root 0 Nov 29 12:24 ../

$ ll -a /proc/acpi/
total 0
dr-xr-xr-x 5 root root 0 Nov 29 12:25 ./
dr-xr-xr-x 223 root root 0 Nov 29 12:24 ../
dr-xr-xr-x 3 root root 0 Nov 29 12:45 ac_adapter/
dr-xr-xr-x 3 root root 0 Nov 29 12:45 battery/
dr-xr-xr-x 3 root root 0 Nov 29 12:45 button/
-r-------- 1 root root 0 Nov 29 12:25 event
-rw-r--r-- 1 root root 0 Nov 29 12:45 wakeup

 lspci -nn | grep -i nvidia
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GT215 [GeForce GT 335M] [10de:0caf] (rev a2)

 cat /proc/version
Linux version 3.2.0-34-generic (buildd@allspice) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #53-Ubuntu SMP Thu Nov 15 10:48:16 UTC 2012

apt-cache show nvidia-current-updates-dev
Package: nvidia-current-updates-dev
Priority: optional
Section: restricted/misc
Installed-Size: 999
Maintainer: Ubuntu Developers <email address hidden>
Architecture: amd64
Source: nvidia-graphics-drivers-updates
Version: 304.64-0ubuntu0.1
Depends: nvidia-current-updates (>= 304.64)
Filename: pool/restricted/n/nvidia-graphics-drivers-updates/nvidia-current-updates-dev_304.64-0ubuntu0.1_amd64.deb
Size: 184460
MD5sum: 7a5e979aca17923f8302f09a22d0703f
SHA1: 0680600ab5ad4647b16bbf6cee9ab86109833ac5
SHA256: 7f2471fe496d3c606e9cab85df1f21a0182af74f6fb6279d6674cf82c926447d
Description-en: NVIDIA binary Xorg driver development files
 This package contains the NVIDIA binary Xorg driver
 development files.
 .
 For more information on this source package visit NVIDIA's homepage
 at http://www.nvidia.com/ .
Description-md5: ef3b76d980ecacaf3116114549ba70ca
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Origin: Ubuntu
Supported: 18m

I have tried all the various boot up parameters.

https://wiki.ubuntu.com/Kernel/Debugging/Backlight

acpi_backlight=vendor :
video.use_bios_initial_backlight=0

All the other sugestions are useless as they only work if there an interface to configure the backlight in /proc/acpi/video or /sys/class/backlight.

I will attach the various files from the debugging backlight wiki.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: nvidia-settings-updates 304.43-0ubuntu0.2
ProcVersionSignature: Ubuntu 3.2.0-34.53-generic 3.2.33
Uname: Linux 3.2.0-34-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu15
Architecture: amd64
Date: Thu Nov 29 12:45:17 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MarkForUpload: True
SourcePackage: nvidia-settings-updates
UpgradeStatus: No upgrade log present (probably fresh install)

[aaron (nelaaro)]

https://wiki.ubuntu.com/Kernel/Debugging/Backlight

files created as per wiki.

[aaron (nelaaro)]

acpidump.txt

[aaron (nelaaro)]

dmidecode.log

[aaron (nelaaro)]

DSDT.dat

[aaron (nelaaro)]

DSDT.dsl

[aaron (nelaaro)]

fwts

[aaron (nelaaro)]

fwts_method

[aaron (nelaaro)]

results.log

[aaron (nelaaro)]

SSDT.dat

[aaron (nelaaro)]

$ cat version
Linux version 3.2.0-34-generic (buildd@allspice) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #53-Ubuntu SMP Thu Nov 15 10:48:16 UTC 2012
$ cat video
[ 3.235886] ACPI: Video Device [VGA1] (multi-head: yes rom: yes post: no)

[aaron (nelaaro)]

Looking through my /var/log/apt/term.log logs I noticed this

INFO:Enable nvidia-current-updates
DEBUG:Parsing /usr/share/nvidia-common/quirks/lenovo_thinkpad
DEBUG:Parsing /usr/share/nvidia-common/quirks/dell_latitude
DEBUG:Parsing /usr/share/nvidia-common/quirks/put_your_quirks_here
DEBUG:Processing quirk ThinkPad T420s
DEBUG:Failure to match GIGABYTE with LENOVO
DEBUG:Quirk doesn't match
DEBUG:Processing quirk Latitude E6530
DEBUG:Failure to match GIGABYTE with Dell Inc.
DEBUG:Quirk doesn't match
Loading new nvidia-current-updates-304.64 DKMS files...

I expect some of the features of my graphics card have been disabled.

Log started: 2012-11-29 13:57:24
(Reading database ...
(Reading database ... 5%
(Reading database ... 10%
(Reading database ... 15%
(Reading database ... 20%
(Reading database ... 25%
(Reading database ... 30%
(Reading database ... 35%
(Reading database ... 40%
(Reading database ... 45%
(Reading database ... 50%
(Reading database ... 55%
(Reading database ... 60%
(Reading database ... 65%
(Reading database ... 70%
(Reading database ... 75%
(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 444690 files and directories currently installed.)
Removing nvidia-experimental-310-dev ...
Removing nvidia-experimental-310 ...
Removing all DKMS Modules
Done.
update-alternatives: using /usr/lib/nvidia-current-updates/ld.so.conf to provide /etc/ld.so.conf.d/x86_64-linux-gnu_GL.conf (x86_64-linux-gnu_gl_conf) in auto mode.
update-alternatives: using /usr/lib/nvidia-current-updates/alt_ld.so.conf to provide /etc/ld.so.conf.d/i386-linux-gnu_GL.conf (i386-linux-gnu_gl_conf) in auto mode.
INFO:Disable nvidia-experimental-310
DEBUG:Parsing /usr/share/nvidia-common/quirks/lenovo_thinkpad
DEBUG:Parsing /usr/share/nvidia-common/quirks/dell_latitude
DEBUG:Parsing /usr/share/nvidia-common/quirks/put_your_quirks_here
update-initramfs: deferring update (trigger activated)
Processing triggers for bamfdaemon ...
Rebuilding /usr/share/applications/bamf.index...
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place
Processing triggers for desktop-file-utils ...
Processing triggers for gnome-menus ...
Processing triggers for man-db ...
Processing triggers for initramfs-tools ...
update-initramfs: Generating /boot/initrd.img-3.2.0-34-generic
(Reading database ...
(Reading database ... 5%
(Reading database ... 10%
(Reading database ... 15%
(Reading database ... 20%
(Reading database ... 25%
(Reading database ... 30%
(Reading database ... 35%
(Reading database ... 40%
(Reading database ... 45%
(Reading database ... 50%
(Reading database ... 55%
(Reading database ... 60%
(Reading database ... 65%
(Reading database ... 70%
(Reading database ... 75%
(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 444483 files and directories currently installed.)
Preparing to replace nvidia-current-updates 304.64-0ubuntu0.1 (using .../nvidia-current-updates_304.64-0ubuntu0.1_amd64.deb) ...
Removing all DKMS Modules
Done.
Unpacking replace...