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ubuntu_user7
Asked: 2018-05-13 11:41:23 +0800 CST

Screen returns to full brightness upon waking from suspend

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I am running Ubuntu 18.04 on a Lenovo 320 laptop. I realize this question has been asked before, but the earlier questions seem to concern much older versions of Ubuntu and were prior to system.d.

So, my issue is that every time my computer wakes from suspend, the screen brightness is reset back to maximum even if the slider control doesn't show it. I like to run my screen brightness at about 60 to 70 percent of maximum to avoid headaches. My computer rather often goes to sleep and this has become a maddening problem for me.

Any help would be greatly appreciated. Thanks.

suspend brightness 18.04

2 Answers

  1. Per this answer on Quora, try this:

    Install xbacklight program by typing the following in the terminal:

    sudo apt-get install xbacklight

    Now press alt+f2 from your keyboard, and type gnome-session-properties. Click on the application, and from the window popped, click add, and fill the following:

    name = Brightness Fixed

    command= xbacklight -set 25

    click add and you're done. Restart to check the effects.

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  2. I have the same problem on my Debian 9 and it has been fixed as follows:

    cd /sys/class/backlight/intel_backlight

    You can find out that the value in the file brightness is the same as that in the file max_brightness. Just reset it to a lower value. Note that this operation requires your root privileges.

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