ogzy

#!/bin/sh
# dimmer.sh
# written by Rob Stockley (rob dash stockley at mowgli dot net dot nz)
# to incrementally change the LCD brightness on a Compaq TC1100 tablet.
# Tested only with Kubuntu 7.04. All comments and suggestions welcome.

ME=`whoami`
if [ $ME = root ]; then
    DISPLAYOWNER=`w -h | awk '{print $1" "$2" "$3}' | grep ":0"`
    USER=`echo $DISPLAYOWNER | awk '{print $1}'`
#   echo working on: $USER
    su -l $USER <<ENDSU
    /usr/bin/dimmer.sh $1 dummy;

ENDSU
    exit 0
fi
# first need to establish whether config file exists and we can write to it
echo $HOME
NV_CONFIG="$HOME/.nvidia-settings-rc"
if ! [ -w $NV_CONFIG ]; then
    echo "$NV_CONFIG is either missing or not writable. Before you run this script you need to run the nvidia-settings GUI application. When you quit the GUI the current driver settings should be written to $NV_CONFIG."
    nvidia-settings
#    exit 0
fi

# now need to read current brightness values
CUR_R=`grep RedBrightness $NV_CONFIG | awk 'BEGIN { FS = "=" } ; { print $2 }'`
CUR_G=`grep GreenBrightness $NV_CONFIG | awk 'BEGIN { FS = "=" } ; { print $2 }'`
CUR_B=`grep BlueBrightness $NV_CONFIG | awk 'BEGIN { FS = "=" } ; { print $2 }'`

# stepping 0.2 gives me five dim and five bright settings
STEP="0.2"
case $1 in
    --reset)
        # reset to driver defaults
        NEW_R='0.0000'
        NEW_G='0.0000'
        NEW_B='0.0000'
        ;;
    --dec)
        # decrease brightness and check limits
        NEW_R=`echo "scale=4; $CUR_R - $STEP" | bc`
        if [ `echo "scale=4; $NEW_R < -1.0" | bc` -eq 1 ]; then
            NEW_R=-1.0
        fi
        NEW_G=`echo "scale=4; $CUR_G - $STEP" | bc`
        if [ `echo "scale=4; $NEW_G < -1.0" | bc` -eq 1 ]; then
            NEW_G=-1.0
        fi
        NEW_B=`echo "scale=4; $CUR_B - $STEP" | bc`
        if [ `echo "scale=4; $NEW_B < -1.0" | bc` -eq 1 ]; then
            NEW_B=-1.0
        fi
        ;;
    --inc)
        # increase brightness and check limits
        NEW_R=`echo "scale=4; $CUR_R + $STEP" | bc`
        if [ `echo "scale=4; $NEW_R > 1.0" | bc` -eq 1 ]; then
            NEW_R=1.0
        fi
        NEW_G=`echo "scale=4; $CUR_G + $STEP" | bc`
        if [ `echo "scale=4; $NEW_G > 1.0" | bc` -eq 1 ]; then
            NEW_G=1.0
        fi
        NEW_B=`echo "scale=4; $CUR_B + $STEP" | bc`
        if [ `echo "scale=4; $NEW_B > 1.0" | bc` -eq 1 ]; then
            NEW_B=1.0
        fi
        ;;
    --help)
        echo "Script: $0"
        echo "Purpose: Change the LCD brightness on a"
        echo "Compaq TC1100 using Nvidia restricted driver. "
        echo "Written by Rob Stockley, October 2007"
        echo
        echo "Usage: $0 [ --reset | --dim | --inc | --help ]"
        echo "Options:"
        echo "  --dec     decrease the brightness a little"
        echo "  --inc     increace the brightness a little"
        echo "  --reset   reset to standard brightness"
        echo "  --help    print this message"
        exit 0
        ;;
    *)
        echo "Usage: $0 [ --reset | --dim | --inc | --help ]"
        exit 0
        ;;
esac

# fix cases where bc leaves us with leading -.
NEW_R=`echo $NEW_R | sed 's/-\./-0\./'`
NEW_G=`echo $NEW_G | sed 's/-\./-0\./'`
NEW_B=`echo $NEW_B | sed 's/-\./-0\./'`

# if we get to here then patch the .nvidia-settings-rc
patch -s $NV_CONFIG << EOF
--- .nvidia-settings-rc 2007-10-10 21:45:26.000000000 +1300
+++ .nvidia-settings-rc.new 2007-10-11 10:00:52.000000000 +1300
@@ -36,3 +36,3 @@
-0/RedBrightness=$CUR_R
-0/GreenBrightness=$CUR_G
-0/BlueBrightness=$CUR_B
+0/RedBrightness=$NEW_R
+0/GreenBrightness=$NEW_G
+0/BlueBrightness=$NEW_B
EOF

# finally the nvidia driver needs to load the new configuration
nvidia-settings -l -c :0