Brightness adjust Ubuntu vs Xubuntu

Question

I have little problem: LiveCD with ubuntu 14.04 can adjust brigthness on laptop and with xubuntu 14.04(installed from mini.iso)

What package i need to install for brightness adjustment.

• OS (x)Ubuntu 14.04
• Laptop: Toshiba TecraA11-182

Answer 1

I understood why brightness adjust haven't worked.

sudo apt-get install xubuntu-desktop 

...doesn't install package xfce4-power-manager. So installing this package helped me to solve this problem:

sudo apt-get install xfce4-power-manager xfce4-power-manager-data xfce4-power-manager-plugins

Next reboot your laptop and enjoy it.

Answer 2

Setting up xbacklight control

Follow these steps:

1. $ sudo nano /etc/default/grub and replace the corresponding line with GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
2. $ sudo update-grub
3. No joking, make sure that the appropriate drivers are actually installed: $ sudo apt install xbacklight xorg xserver-xorg-video-intel
4. Issuing $ find /sys -type f -name brightness should yield something like /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight/brightness
5. $ cd /sys/class This directory should contain a soft link called brightness to the brightness device discovered in the previous step. Should it be missing, create it: $ sudo ln -s /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight/brightness /sys/class/brightness
6. $ sudo nano /etc/X11/xorg.conf should read:

Section "Device"
    Identifier      "Device0"
    Driver          "intel"
    Option          "Backlight"      "intel_backlight"
EndSection
Section "Monitor"
    Identifier      "Monitor0"
EndSection
Section "Screen"
    Identifier      "Screen0"
    Monitor         "Monitor0"
    Device          "Device0"
EndSection

7. The assignment of the physical XF86MonBrightnessDown and XF86MonBrightnessUp keys is explained here for Xubuntu LTS or XFCE users.
8. Finally, reboot for these changes to take effect.