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

Address: http://www.archlinuxchina.com/forum/thread-56-1-1.html

My Linux desktop version is Linux mint13 Maya, Which is used on a laptop.

The screen brightness is the brightest when you start the system. You can adjust the brightness of the backlight through FN + F6/F7, but the maximum brightness is 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 at the end:
# 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.

Now, we need to install the laptop-mode-tools tool first. OK, it's very simple.

1. Apt-Get install laptop-mode-Tools

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The laptop mode is automatically enabled after the tool is installed, and the/etc/laptop-mode/laptop-mode.conf is enabled for configuration below

2, configure/etc/laptop-mode/laptop-mode.conf
(1) use laptop mode in alternating current mode:

1. #
   
2. # Enable laptop mode when on AC power.
   
3. #
   
4. Enable_laptop_mode_on_ac = 1
   
5. # The default value of battery is 1.

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(2) Configure LCD brightness control
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 the file and perform the following settings:

1. #
   
2. # Shocould laptop mode tools control LCD brightness?
   
3. # Set to 1 and enable
   
4. Control_brightness = 1
   
5. 
   
6. 
   
7. #
   
8. # Commands to execute to set the brightness on your LCD
   
9. # "Echo 13" is to write the brightness value 13 into the brightness_output file, and the brightness value is set to its own value.

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1. Batt_brightness_command = "Echo 13"
   
2. Lm_ac_brightness_command = "Echo 13"
   
3. Nolm_ac_brightness_command = "Echo 13"
   
4. Brightness_output = "/sys/class/backlight/acpi_video0/brightness"

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OK. After the preceding configuration is complete, restart. In this way, you do not need to manually press FN + F6/F7 each time you start the system.

Note:
XX>/sys/class/backlight/acpi_video0/brightness write RC. Local does not work either. Through laptop
Mode tools can achieve our goal.