im using latest version of ubuntu and using KDE, after changing brighness in `Screen Brighness` from kde battery settings after 10~15 second automatically change that without any delay.
detail: Samsung Laptop 300e5x a0j
shell command:
Code:
xrandr --output LVDS --set BACKLIGHT 102 --set BACKLIGHT_CONTROL legacy --output VGA --auto
result:
Code:
tux-world@tux-world ~ $ xrandr --output LVDS --set BACKLIGHT 102 --set BACKLIGHT_CONTROL legacy --output VGA --auto
warning: output LVDS not found; ignoring
warning: output VGA not found; ignoring
X Error of failed request: BadRROutput (invalid Output parameter)
Major opcode of failed request: 140 (RANDR)
Minor opcode of failed request: 15 (RRGetOutputProperty)
Serial number of failed request: 30
Current serial number in output stream: 30
shell command:
Code:
tux-world@tux-world ~ $ cat /sys/class/backlight/samsung/brightness
result:
after change:
Code:
tux-world@tux-world ~ $ cat /sys/class/backlight/samsung/brightness
result:
after 10~15 second automatically change:
result:
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