Backlight: Difference between revisions
imported>Con-f-use example udev rule for /sys/class method |
imported>Vater m form (fixing Category:Pages with syntax highlighting errors) and add a first (content) category |
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programs.light.enable = true; | programs.light.enable = true; | ||
</syntaxhighlight> | </syntaxhighlight> | ||
The following commands will allow you to test <code>light</code>: | The following commands will allow you to test <code>light</code>: | ||
*<code>light -U 30</code> — the screen should become darker. | * <code>light -U 30</code> — the screen should become darker. | ||
*<code>light -A 30</code> — the screen should become brighter. | * <code>light -A 30</code> — the screen should become brighter. | ||
Be careful using <code>light -U</code>, as you might turn your backlight completely off! You will not be able to see what you're typing anymore. | Be careful using <code>light -U</code>, as you might turn your backlight completely off! You will not be able to see what you're typing anymore. | ||
== <code>brightnessctl</code> == | == <code>brightnessctl</code> == | ||
{{nixos:package|brightnessctl}} ([https://github.com/Hummer12007/brightnessctl homepage]) is another option, which, like <code>light</code>, would work even without X or on Wayland. | {{nixos:package|brightnessctl}} ([https://github.com/Hummer12007/brightnessctl homepage]) is another option, which, like <code>light</code>, would work even without X or on Wayland. | ||
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== <code>/sys/class/backlight/...</code> == | == <code>/sys/class/backlight/...</code> == | ||
The <code>/sys/class/backlight/*/brightness</code> files are a built-in way to set brightness. Use them e.g. with: | The <code>/sys/class/backlight/*/brightness</code> files are a built-in way to set brightness. Use them e.g. with: | ||
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to set the brightness to <code>300</code>, where the maximum is stored in <code>brightness_max</code>. You can set file permissions e.g. with a udev rule, if you don't want to use sudo. Here is an example udev rule, where you will likely have to replace intel_backlight, with the name in your /sys/class/backlight/: | to set the brightness to <code>300</code>, where the maximum is stored in <code>brightness_max</code>. You can set file permissions e.g. with a udev rule, if you don't want to use sudo. Here is an example udev rule, where you will likely have to replace intel_backlight, with the name in your /sys/class/backlight/: | ||
<syntaxhighlight lang= | <syntaxhighlight lang=nix> | ||
services.udev.extraRules = '' | services.udev.extraRules = '' | ||
ACTION=="add", SUBSYSTEM=="backlight", KERNEL=="intel_backlight", MODE="0666", RUN+="${pkgs.coreutils}/bin/chmod a+w /sys/class/backlight/%k/brightness" | ACTION=="add", SUBSYSTEM=="backlight", KERNEL=="intel_backlight", MODE="0666", RUN+="${pkgs.coreutils}/bin/chmod a+w /sys/class/backlight/%k/brightness" | ||
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Depending on the tools that work for controlling the backlight you will be able to choose one of those options. | Depending on the tools that work for controlling the backlight you will be able to choose one of those options. | ||
{| class="wikitable | {| class="wikitable" | ||
|- | |- | ||
! | ! | ||
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* NixOS 19.09pre173166.373488e6f4c on a Lenovo X240 | * NixOS 19.09pre173166.373488e6f4c on a Lenovo X240 | ||
it may work on other models, but is unconfirmed. See [[actkbd]] for details on finding out the proper key bindings. Also check if the path to the light binary is correct.}} | |||
<syntaxhighlight lang= | <syntaxhighlight lang=nix> | ||
programs.light.enable = true; | programs.light.enable = true; | ||
services.actkbd = { | services.actkbd = { | ||
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== OLED Screens == | == OLED Screens == | ||
OLED screens do not have a backlight, but their perceived brightness can be changed via xrandr: | OLED screens do not have a backlight, but their perceived brightness can be changed via xrandr: | ||
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* [https://wiki.archlinux.org/index.php/backlight Arch Linux wiki page about the backlight] | * [https://wiki.archlinux.org/index.php/backlight Arch Linux wiki page about the backlight] | ||
[[category:hardware]] | |||