Você pode tentar o seguinte, isso pode lhe trazer sorte.
- Abra o seu terminal ( Ctrl + Alt + T )
-
sudo vi /etc/default/acpi_support
-
Encontre e ative esta linha (remova o # para trás):
ENABLE_LAPTOP_MODE=true
- Instale a ferramenta do modo laptop em Modo de notebook
-
sudo vi /etc/laptop-mode/laptop-mode.conf
# Enable laptop mode when on AC power.
ENABLE_LAPTOP_MODE_ON_AC=1
# Should laptop mode tools control LCD brightness?
CONTROL_BRIGHTNESS=1
# Commands to execute to set the brightness on your LCD
BATT_BRIGHTNESS_COMMAND="echo 0"
LM_AC_BRIGHTNESS_COMMAND="echo 9"
NOLM_AC_BRIGHTNESS_COMMAND="echo 9"
BRIGHTNESS_OUTPUT=”/sys/class/backlight/acpi_video1/brightness”
Você pode ler as instruções antes de editar o arquivo:
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# * If your system has the file “/proc/acpi/video/VID/LCD/brightness” (VID may
# be VID1 or similar), use this file as BRIGHTNESS_OUTPUT, and use
# the command “echo “. The possible values can be listed using the
# command
#
# cat /proc/acpi/video/VID/LCD/brightness
# * If you have a file /sys/class/backlight/…/brightness, then you can use
# that file as BRIGHTNESS_OUTPUT, and the command “echo “.
#
# As far as I understand it the values are between 0 and
# the value contained in the file /sys/class/backlight/…/max_brightness.
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