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Whenever I switch ON my PC, I realized that the brightness resets to maximum. So I modified /etc/rc.local file with this :



echo 40 | sudo tee /sys/class/backlight/nvidia_backlight/brightness
...

Thanks a lot Toz !! :)
Everything works fine now...
The hot keys and the GUI control.
But still I don't know why my Brightness resets to maximum when I open Firefox or Thunderbird ?
It does not...

Finally !!! I'm able to control the brightness through the code


echo 20 | sudo tee /sys/class/backlight/nvidia_backlight/brightness
However, the code


echo 1 | sudo tee...

After I re-installed nvidiabl drivers again, I get


/sys/class/backlight/nvidia_backlight
34487
126
127
/sys/class/backlight/sony
1
1

No changes on the screen...

No, no changes on the screen :(

Before installing nvidia drivers from software-properties-gtk, I had problem when ubuntu starts..
I get a plain purple screen after which I get the login screen.
While shut down I get the usual...

Modified grub like this :



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`...

After executing the code "echo 4 | sudo tee /sys/class/backlight/sony/brightness"

I get the response for "for interface in /sys/class/backlight/*; do echo $interface; cat $interface/brightness;...

No the code

"echo 4 | sudo tee /sys/class/backlight/sony/brightness"

still does not make changes to my screen...

As I've already mentioned, the values in brightness in...

I uninstalled nvidiabl.
Modified the grub like this :



GRUB_DEFAULT=0
GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null...

I installed the Nvidia drivers from software-properties-gtk,
changed the xorg.conf file like this :



Section "Device"
Identifier "Default Device"
Driver "nvidia"
...

I've downloaded the nvidia drivers from Nvidia site.
I don't know the version but I hope the filename "NVIDIA-Linux-x86_64-304.64.run" gives you the information you needed..

Pastebin for /var/log/dmesg

PasteBin for /var/log/Xorg.0.log

The results for cat /proc/cmdline :

BOOT_IMAGE=/boot/vmlinuz-3.5.0-18-generic root=UUID=446e1f28-d397-4eef-a7fb-fa0eda88129a ro quiet splash vt.handoff=7

The results for lsmod :

Module ...

acpi_backlight=vendor statement is also not working.

These are my results for cat proc/cmdline :

BOOT_IMAGE=/boot/vmlinuz-3.5.0-18-generic root=UUID=446e1f28-d397-4eef-a7fb-fa0eda88129a ro...

This info is available in my /etc/default/grub
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...

I've installed Ubuntu 12.10 recently.
When ever I press Fn keys along with F5/F6 it shows that the brightness decreases / increases accordingly. But no difference on the screen.

I tried...