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.config/i3blocks/backlight/README.md

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