如何从命令行（或通过脚本）更改LCD亮度？

#1 楼

xrandr -q | grep " connected"

LVDS1 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 331mm x 207mm

xrandr --output LVDS1 --brightness 0.5

#2 楼

sudo apt-get install xbacklight

xbacklight -inc 10

xbacklight -dec 10 

#3 楼

echo 400 | sudo tee /sys/class/backlight/intel_backlight/brightness

#4 楼

sudo setpci -s 00:02.0 F4.B=80

xgamma -gamma .75

#5 楼

 # Step up:
gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power --method org.gnome.SettingsDaemon.Power.Screen.StepUp

# Step down:
gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power --method org.gnome.SettingsDaemon.Power.Screen.StepDown
 

#6 楼

 #!/bin/bash
TARGET="acpi_video0"
cd /sys/class/backlight
MAX="$(cat "${TARGET}/max_brightness")"
# The `/1` at the end forced bc to cast the result 
# to an integer, even if  is a float (which it 
# should be)
LOGIC="$(echo "( * ${MAX})/1" | bc)"
for i in */; do
    if [[ "${TARGET}/" != "$i" && -e "${i}brightness" ]]; then
        cat "${i}max_brightness" > "${i}brightness"
    fi
done
echo "$LOGIC" > "${TARGET}/brightness"
 

sudo ./set-brightness.sh 0.5

#7 楼

xrandr --output LVDS1 --brightness 0.9

#8 楼

xrandr --output VGA1 --brightness 0.5; sleep 20; xrandr --output VGA1 --brightness 1

#9 楼

#10 楼

qdbus org.kde.Solid.PowerManagement /org/kde/Solid/PowerManagement/Actions/BrightnessControl setBrightness 55

qdbus org.kde.Solid.PowerManagement /org/kde/Solid/PowerManagement/Actions/BrightnessControl brightnessMax

qdbus org.kde.Solid.PowerManagement /org/kde/Solid/PowerManagement/Actions/BrightnessControl setBrightnessSilent 2000

#11 楼

#!/bin/bash
function main_menu
{
    sudo clear
    cursetting=$(cat /sys/class/backlight/intel_backlight/brightness)
    maxsetting=$(cat /sys/class/backlight/intel_backlight/max_brightness)
    powersave=$((maxsetting/5))
    conservative=$((powersave*2))
    medium=$((powersave*3))
    performance=$((powersave*4))
    echo ""
    echo "----------------------- Brightness -----------------------"
    echo " 1. Set Display to Minimum (Powersave) brightness setting."
    echo " 2. Set Display to Low (Conservative) brightness setting."
    echo " 3. Set Display to Medium brightness setting."
    echo " 4. Set Display to High (Performance) brightness setting."
    echo " 5. Set Display to Maximum brightness setting."
    echo " 6. Exit."
    echo "----------------------------------------------------------"
    if [ $cursetting -eq $powersave ]; then
     cursetting='Minimum'
    else
     if [ $cursetting -eq $conservative ]; then
      cursetting='Conservative'
     else
      if [ $cursetting -eq $medium ]; then
       cursetting='Medium'
      else
       if [ $cursetting -eq $performance ]; then
        cursetting='Performance'
       else
        if [ $cursetting -eq $maxsetting ]; then
         cursetting='Maximum'
        fi
       fi
      fi
     fi
    fi
    echo "        Current Display Setting - "$cursetting;
    choice=7
    echo ""
    echo -e "Please enter your choice: \c"
}

function press_enter
{
    echo ""
    echo -n "Press Enter to continue."
    read
    main_menu
}

main_menu
while [ $choice -eq 7 ]; do
read choice

if [ $choice -eq 1 ]; then
 echo $powersave | sudo tee /sys/class/backlight/intel_backlight/brightness
 main_menu
else
 if [ $choice -eq 2 ]; then
  echo $conservative | sudo tee /sys/class/backlight/intel_backlight/brightness
  main_menu
 else
  if [ $choice -eq 3 ]; then
   echo $medium | sudo tee /sys/class/backlight/intel_backlight/brightness
   main_menu
  else
   if [ $choice -eq 4 ]; then
    echo $performance | sudo tee /sys/class/backlight/intel_backlight/brightness
    main_menu
   else
    if [ $choice -eq 5 ]; then
     echo $maxsetting | sudo tee /sys/class/backlight/intel_backlight/brightness
     main_menu
    else
     if [ $choice -eq 6 ]; then
      exit;
     else
      echo -e "Please enter the NUMBER of your choice: \c"
      choice = 7
     fi
    fi
   fi
  fi
 fi
fi
done

#12 楼

ddccontrol -p -r 0x10 -w 50

#13 楼

BRIGHTNESS=50 # 0 to 100

dbus-send \
--session \
--type=method_call \
--dest="org.gnome.SettingsDaemon.Power" \
/org/gnome/SettingsDaemon/Power \
org.freedesktop.DBus.Properties.Set \
string:"org.gnome.SettingsDaemon.Power.Screen" \
string:"Brightness" \
variant:int32:$BRIGHTNESS

#14 楼

xback() (
  done=false;
  echo "less: h, more: l, quit: q"
  while ! $done; do
    read -rsn1 key
    if [ "$key" = h ]; then
      xbacklight -dec 10
    elif [ "$key" = l ]; then
      xbacklight -inc 10
    elif [ "$key" = q ]; then
      done=true
    fi
    printf "\r$(xbacklight -get) "
  done
)

#15 楼

cd /sys/class/backlight/intel_backlight/
cat max_brightness | sudo tee brightness

#16 楼

sudo apt install brightctl

sudo usermod $(whoami) -a -G video

#Increase brightness
/usr/bin/brightnessctl -d intel_backlight set +10

#Reduce brightness
/usr/bin/brightnessctl -d intel_backlight set 10-

#Increase brightness
bindsym XF86MonBrightnessUp exec  /usr/bin/brightnessctl -d intel_backlight set +10

#Reduce brightness
bindsym XF86MonBrightnessDown exec /usr/bin/brightnessctl -d intel_backlight set 10-