Language: C C++ D Haskell Lua OCaml PHP Perl Plain Text Python Ruby Scheme Tcl #!/bin/bash # increase/decrease/set/get the backlight brightness (range 0-255) # # PCI device on which to operate DEVICE=00:02.0 # Amount to raise/lower the backlight when called with "up" or "down" AMOUNT=8 # Minimum backlight value reachable via "down" MIN=1 # Default backlight level when toggling on DEFAULT=64 #get current brightness in hex and convert to decimal var1=`setpci -s $DEVICE F4.B` var1d=$((0x$var1)) case "$1" in up) #calculate new brightness var2=`echo "ibase=10; obase=16; a=($var1d+$AMOUNT);if (a<255) print a else print 255" | bc` echo "$0: increasing brightness from 0x$var1 to 0x$var2" setpci -s $DEVICE F4.B=$var2 ;; down) #calculate new brightness var2=`echo "ibase=10; obase=16; a=($var1d-$AMOUNT);if (a>$MIN) print a else print $MIN" | bc` echo "$0: decreasing brightness from 0x$var1 to 0x$var2" setpci -s $DEVICE F4.B=$var2 ;; set) #n.b. this does allow "set 0" i.e. backlight off echo "$0: setting brightness to 0x$2" setpci -s $DEVICE F4.B=$2 ;; get) echo "$0: current brightness is 0x$var1" ;; toggle) if [ $var1d -eq 0 ] ; then echo "toggling up" setpci -s $DEVICE F4.B=$DEFAULT else echo "toggling down" setpci -s $DEVICE F4.B=0 fi ;; *) echo "usage: $0 {up|down|set <val>|get|toggle}" ;; esac exit 0 Private [?] Run code