i know this question have been asked many times but i really cant get it to work. I just installed Ubuntu 13.10 on my Lenovo G580 laptop and i'm trying to manage screen brightness when on battery or ac adapter.
Now i installed laptop-mode-tools and enabled it by appending "LAPTOP_MODE_ENABLED=true" in the "/etc/default/acpi-support"
Next i configured the "/etc/laptop-mode/conf.d/lcd-brightness.conf" configuration file in this format:
CONTROL_BRIGHTNESS=1 # # Commands to execute to set the brightness on your LCD # BATT_BRIGHTNESS_COMMAND="echo 7" LM_AC_BRIGHTNESS_COMMAND="echo 11" NOLM_AC_BRIGHTNESS_COMMAND="echo 11" BRIGHTNESS_OUTPUT="/sys/class/backlight/acpi_video0/brightness"
But it has no effect after rebooting many times, so please does any one has solution for this?