How to save the brightness settings (backlight brightness) of a notebook in linux)

In linux, how does one save the screen brightness settings (backlight brightness) of a notebook? the linux desktop version I use is linuxmint13maya. the screen brightness is the brightest each time I start the system, you can adjust the brightness of the backlight through Fn + F6/F7, but the maximum brightness will be restored after restart. Is it necessary to start the instance every time... in linux, how does one save the screen brightness settings (backlight brightness) of a notebook? my linux desktop version is linux mint13 maya, and the screen brightness is the brightest each time it is started, you can adjust the brightness of the backlight through Fn + F6/F7, but the maximum brightness will be restored after restart.
Do you need to adjust the brightness by Fn + F6/F7 after each boot? Is there a permanent solution? Of course! 1, cat/etc/default/acpi-support, found that there is such a comment: # Note: to enable "laptop mode" (to spin down your hard drive for longer # periods of time ), install the laptop-mode-tools package and configure # it in/etc/laptop-mode/laptop-mode.conf. well, we had to install the laptop-mode-tools tool first. OK. it's very simple. after apt-get install laptop-mode-tools is installed, it will automatically enable the laptop mode, open/etc/laptop-mode/laptop-mode.conf below to configure www.2cto.com 2, configure/etc/laptop-mode/laptop-mode.conf
(1) use laptop mode in alternating current mode: # Enable laptop mode when on AC power. # ENABLE_LAPTOP_MODE_ON_AC = 1
# The default value of the battery is 1 (2), and the LCD brightness control is configured.
In/etc/laptop-mode/laptop-mode.conf left find right all wood have found CONTROL_BRIGHTNESS this option, view Help Manual: man laptop-mode.conf, the LCD brightness was originally controlled in/etc/laptop-mode/conf. d/lcd-brightness.conf in this file. OK. open this file and perform the following settings: # shocould laptop mode tools control LCD brightness? # Set to 1 and enable CONTROL_BRIGHTNESS = 1 # Commands to execute to set the brightness on your LCD # "echo 13" means to write brightness value 13 to the BRIGHTNESS_OUTPUT file, the brightness value can be set based on your own conditions. Www.2cto.com BATT_BRIGHTNESS_COMMAND = "echo 13" highlight = "echo 13" highlight = "echo 13" BRIGHTNESS_OUTPUT = "/sys/class/backlight/acpi_video0/brightness" OK, restart. In this way, you do not need to manually press Fn + F6/F7 each time you start the system. note: writing echo xx>/sys/class/backlight/acpi_video0/brightness to rc. local does not work. Using laptop mode tools for control can achieve our goal. From archlinuxchina Forum