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#!/bin/bash
if ! command -v slx-brightness &> /dev/null; then
echo "Error: Required tool slx-brightness not in path"
exit 1
fi
# How many steps we want from min to max
declare -rg steps=15
# Look for brightness config file
#
max_file="/sys/class/backlight/intel_backlight/max_brightness"
cur_file="/sys/class/backlight/intel_backlight/brightness"
if ! [ -e "$max_file" ] || ! [ -e "$cur_file" ]; then
for max_file in /sys/class/backlight/*/max_brightness; do
cur_file="${max_file%/*}/brightness"
[ -e "$max_file" ] && [ -e "$cur_file" ] && break
done
fi
if ! [ -e "$max_file" ] || ! [ -e "$cur_file" ]; then
echo "No brightness controls found, exiting"
exit 0
fi
# Calc sane limits
#
max=$( cat "$max_file" )
if ! (( max > 0 )); then
echo "Max brightness is '$max', doing nothing"
exit 0
fi
min=$(( max / ( steps + 1 ) ))
# Start our daemon
#
slx-brightness "$cur_file" "$min" "$max" "$steps" &
pid=$!
# Give it time to start
sleep 3
if ! kill -0 "$pid"; then
# slx-brightness exits if it doesn't find a known input device for brightness control
echo "slx-brightness didn't find a suitable device :-("
t="$( mktemp )"
if [ -n "$t" ]; then
slx-brightness -l &> "$t"
slxlog --delete --sync "screen-brightness" \
"Device seems to have controllable backlight, but cannot find suitable input device" "$t"
fi
exit 0
fi
# Disable handling of keys by xfce-power-manager
#
pmfile="/etc/xdg/xfce4/xfconf/xfce-perchannel-xml/xfce4-power-manager.xml"
if ! [ -s "$pmfile" ]; then
mkdir -p "${pmfile%/*}"
cat > "$pmfile" <<-EOF
<?xml version="1.0" encoding="UTF-8"?>
<channel name="xfce4-power-manager" version="1.0" locked="*" unlocked="root">
<property name="xfce4-power-manager" type="empty">
<property name="handle-brightness-keys" type="bool" value="false"/>
</property>
</channel>
EOF
else
xmlstarlet ed -u '/channel/property/property[@name="handle-brightness-keys"]/@value' \
-v "false" "$pmfile" > "$pmfile.tmp" \
&& mv -f "$pmfile.tmp" "$pmfile"
fi
exit 0
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