Update cheatsheets

linux/xbacklight

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# xbacklight
+
+> Utility to adjust backlight brightness using the RandR extension.
+> More information: <https://gitlab.freedesktop.org/xorg/app/xbacklight>.
+
+- Get the current screen brightness as a percentage:
+
+`xbacklight`
+
+- Set the screen brightness to 40%:
+
+`xbacklight -set {{40}}`
+
+- Increase current brightness by 25%:
+
+`xbacklight -inc {{25}}`
+
+- Decrease current brightness by 75%:
+
+`xbacklight -dec {{75}}`
+
+- Increase backlight to 100%, over 60 seconds (value given in ms), using 60 steps:
+
+`xbacklight -set {{100}} -time {{60000}} -steps {{60}}`