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31 lines
1.3 KiB
Markdown
31 lines
1.3 KiB
Markdown
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Story: Today is my first day with Arch. Whatever problem I'm facing is clearly documented in Arch Wiki. I'm falling in love with the system. It's just another level. I feel like I don't even need to create TIL files anymore as everything is just couple of keystrokes away. I'll see how it goes.
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Read [this](https://wiki.archlinux.org/title/backlight) and you are done :D
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Here is the tl;dr part.
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Run `ls /sys/class/backlight/` to see which graphics card is managing your backlight. I'm assuming you get an ouput like `intel_backlight`. Then run this:
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```
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ls /sys/class/backlight/intel_backlight
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actual_brightness bl_power brightness device/
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max_brightness power/ scale subsystem/ type uevent
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```
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Read the `max_brightness` value and then set your brightness to something smaller than that value:
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```
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cat /sys/class/backlight/intel_backlight/max_brightness
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echo 100 > /sys/class/backlight/intel_backlight/brightness
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```
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Note: You should be `root` to execute the previous command. If you want to modify it without root priveleges:
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```
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/etc/udev/rules.d/backlight.rules
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RUN+="/bin/chgrp video /sys/class/backlight/intel_backlight/brightness"
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RUN+="/bin/chmod g+w /sys/class/backlight/intel_backlight/brightness"
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```
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and add yourself to the `video` group.
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```
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sudo usermod -aG video $USER
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```
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Now you can use [`light`](https://github.com/haikarainen/light).
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