Hello guys,
I've solved this problem doing something like this=
http://askubuntu.com/questions/76081/brightness-not-working-after-installing-nvidia-driver
I'm using Ubuntu 14.04 64bits release in my Vostro 3300 with Nvidia
GeForce 310M. I think the problem is about Nvidia/X11 receive the
variable passed by Fn+Up/Down, because you can check with 'cat
/sys/class/backlight/acpi_video0/brightness' that the value changes
after you press Fn+Up/Down but the backlight bright doesn't.
The full proceadure that worked for me:
1. I edited the grub with
# nano /etc/default/grub
and edited this line:
GRUB_CMDLINE_LINUX="acpi_osi=Linux"
2. After that:
# update-grub
3. Installed the Nvidia driver (proprietary-tested) on Ubuntu Software
Center, and REBOOT.
4. Checked if my video card was identified:
# lspci | grep -i vga
5. Created the X11 conf file with (there wasn't this file there yet):
# nano /usr/share/X11/xorg.conf.d/10-nvidia-brightness.conf
and write down on it these lines:
------------------
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce 310M"
Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection
------------------
the most important part is this one: Option "RegistryDwords"
"EnableBrightnessControl=1"
6. Saved and reboot.
Now everything works fine and the values (from 0 to 15 that you can
check here /sys/class/backlight/acpi_video0/brightness) are now equal
total darkness to a full bright screen.
--
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1273234
Title:
[acpi backlight] Can't control screen brightness
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1273234/+subscriptions
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