After installing fresh Debian 8 with Cinnamon desktop manager on my work laptop, I noticed that my brightness keys (Fn-F5 or Fn-F6) doesn’t do anything. Both the Power Management and Display Settings doesn’t have those settings to increase or decrease brightness.
After a quick googling, I found out that I need to add some entries to my X11 conf.
- With root privileges, create new file /usr/share/X11/xorg.conf.d/20-intel.conf
- Use these as the content for the newly created file:
Option "Backlight" "intel_backlight"
For information, my work laptop is ASUS X45C with Intel i3 Processor and Intel HD® Graphics.