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51 lines
1.2 KiB
Markdown
51 lines
1.2 KiB
Markdown
# backlight
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Show the screen brightness value given by `xbacklight`.
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Clicking uses `xset` to turn off the backlight, scrolling increases or decreases
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the brightness.
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## Setup / Usage
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Example i3blocks configuration:
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```
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[backlight]
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command=$SCRIPT_DIR/backlight
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label=☀
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interval=20
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#STEP_SIZE=5
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#USE_SUDO=0
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```
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- right click: turn off backlight
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- scroll: increase/decrease the brightness in percentage steps according to `STEP_SIZE`
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## Dependencies
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These tools from the xorg-suite are needed:
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- `xorg-xbacklight`
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- `xorg-xset`
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You need to allow the user to change the brightness (only if you want to use scrolling).
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If you don't have the proper permissions, you will get an error like
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```bash session
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$ xbacklight -inc 5
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/usr/bin/xbacklight: [Errno 13] Permission denied: '/sys/class/backlight/intel_backlight/brightness'
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```
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One option is to create a [udev rule](https://wiki.archlinux.org/index.php/Backlight#Udev_rule).
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Another option is to allow the user to execute `xbacklight` without a password using the
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[sudoers file](https://wiki.archlinux.org/index.php/Sudo#Configuration).
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For the user `<user>` it would be something like
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```
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<user> ALL=(ALL) NOPASSWD: /usr/bin/xbacklight
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```
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Then use `USE_SUDO=1` in the configuration of this block.
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