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Description of problem: gnome-power-manager brightness slider does not control screen brightness, on gnome-brightness-applet or power manager. Version-Release number of selected component (if applicable): xorg-x11-server-Xorg-1.17.4-9.5.el6_8.x86_64 gnome-power-manager-2.28.3-7.el6_4.1.x86_64 How reproducible: always Steps to Reproduce: 1. Adjust brightness slider Actual results: Slider moves and xrandr backlight property changes; no other effect seen Expected results: Backlight brightness changes Additional info: Screen brightness can be adjusted successfully by writing to /sys/class/backlight/intel_backlight/brightness [intel_backlight]# xrandr --props | grep -i backlight BACKLIGHT: 6 Backlight: 6 [intel_backlight]# cat actual_brightness 550 ### Move slider - no visible brightness change [intel_backlight]# xrandr --props | grep -i backlight BACKLIGHT: 15 Backlight: 15 [intel_backlight]# cat actual_brightness 550 [intel_backlight]# echo 300 >brightness ### screen brightness changes [intel_backlight]# xrandr --props | grep -i backlight BACKLIGHT: 15 Backlight: 15 [intel_backlight]# cat actual_brightness 300