41 lines
727 B
Plaintext
41 lines
727 B
Plaintext
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#!/bin/bash
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# Keys: XF86MonBrightnessUp, XF86MonBrightnessDown
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class=intel_backlight
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dir=/sys/class/backlight/$class
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cur=$(cat $dir/brightness)
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max=$(cat $dir/max_brightness)
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step=$(("$2" + 0))
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cur_pct=$((100 * $cur / $max))
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case "$1" in
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"up")
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echo "up $2%"
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target_pct=$(($cur_pct + $2))
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;;
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"down")
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echo "down $2%"
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target_pct=$(($cur_pct - $2))
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;;
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*)
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echo "Backlight at $cur/$max ($cur_pct%)"
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exit 0
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esac
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if [ "$target_pct" -lt "0" ]; then
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target_pct=0
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fi
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if [ "$target_pct" -gt "100" ]; then
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target_pct=100
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fi
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target_val=$(($max * $target_pct / 100))
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echo "Backlight at $cur/$max ($cur_pct%)"
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echo "Target $target_val ($target_pct%)"
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echo "Dest $dir/brightness"
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echo $target_val > $dir/brightness
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