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This article mainly introduces how to solve the problem that every startup screen of the ubuntu system is the maximum brightness, which has a certain reference value, and interested friends can refer to it. I hope you can learn a lot after reading this article.

First of all, you need to make sure you have this file:

/ sys/class/backlight/acpi_video0/brightness

The value from cat is your current screen brightness.

Let's modify the following file to add some user startup settings:

The code is as follows:

Sudo gedit / etc/rc.local

Add the following code above exit 0 (make sure exit 0 is not commented out):

The code is as follows:

Echo screen luminance value > / sys/class/backlight/acpi_video0/brightness

In this way, the boot will read the file and write the screen luminance value into the brightness file dynamically to change the current brightness.

The following method is similar to the above, but is sure to be used

After entering the system, first adjust the appropriate brightness, and then query the value of the brightness.

Then follow the steps below.

The code is as follows:

$cat / sys/class/backlight/intel_backlight/brightness

nine hundred and seventy six

$sudo vim / etc/rc.local

# add the following command, and the next time you turn it on, the brightness you are adjusting now will be displayed.

The code is as follows:

Echo 976 > / sys/class/backlight/intel_backlight/brightness

If the above does not work, replace brightness with actual_brightness

The code is as follows:

/ sys/class/backlight/intel_backlight/actual_brightness

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