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Ubuntu system how to set the boot screen brightness, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can gain something.

1. Find / sys/class/backlight/acpi_video0, which contains the parameters of screen brightness

2. Open brightness, and the number displayed is the current luminance parameter.

3. Find / etc/rc.local

4. The contents are as follows

5. Open the terminal and enter the following: sudo gedit / etc/rc.local

6. After entering the password, insert a line before exit 0: echo 0 > / sys/class/backlight/acpi_video0/brightness

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