85 lines
2.9 KiB
Bash
Executable File
85 lines
2.9 KiB
Bash
Executable File
#!/usr/bin/env bash
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# description: Get/set screen brightness via PowerDevil D-Bus. Args: [get|set <percent>|up|down]
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# NOTE: PowerDevil uses absolute values (0 to brightnessMax, typically 10000).
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# This tool accepts PERCENTAGES (0-100) and converts internally.
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set -euo pipefail
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SERVICE="org.kde.Solid.PowerManagement"
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OBJ_PATH="/org/kde/Solid/PowerManagement/Actions/BrightnessControl"
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IFACE="org.kde.Solid.PowerManagement.Actions.BrightnessControl"
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cmd="${1:-get}"
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# Get max brightness (needed for percentage conversion)
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get_max() {
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gdbus call --session --dest "$SERVICE" \
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--object-path "$OBJ_PATH" \
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--method "$IFACE.brightnessMax" | \
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sed 's/(//;s/,)//'
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}
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# Get current brightness (absolute)
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get_current() {
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gdbus call --session --dest "$SERVICE" \
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--object-path "$OBJ_PATH" \
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--method "$IFACE.brightness" | \
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sed 's/(//;s/,)//'
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}
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case "$cmd" in
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get)
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max=$(get_max)
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current=$(get_current)
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percent=$(( current * 100 / max ))
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echo "${percent}% ($current/$max)"
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;;
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set)
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percent="${2:?usage: gui_brightness set <percent 0-100>}"
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if [ "$percent" -lt 0 ] || [ "$percent" -gt 100 ]; then
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echo "ERROR: percent must be 0-100" >&2
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exit 1
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fi
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max=$(get_max)
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value=$(( percent * max / 100 ))
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gdbus call --session --dest "$SERVICE" \
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--object-path "$OBJ_PATH" \
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--method "$IFACE.setBrightness" "$value" >/dev/null
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echo "brightness: ${percent}% ($value/$max)"
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;;
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up)
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step="${2:-10}"
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max=$(get_max)
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current=$(get_current)
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current_pct=$(( current * 100 / max ))
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new_pct=$(( current_pct + step ))
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[ "$new_pct" -gt 100 ] && new_pct=100
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value=$(( new_pct * max / 100 ))
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gdbus call --session --dest "$SERVICE" \
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--object-path "$OBJ_PATH" \
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--method "$IFACE.setBrightness" "$value" >/dev/null
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echo "brightness: ${new_pct}% ($value/$max)"
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;;
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down)
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step="${2:-10}"
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max=$(get_max)
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current=$(get_current)
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current_pct=$(( current * 100 / max ))
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new_pct=$(( current_pct - step ))
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[ "$new_pct" -lt 0 ] && new_pct=0
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value=$(( new_pct * max / 100 ))
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gdbus call --session --dest "$SERVICE" \
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--object-path "$OBJ_PATH" \
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--method "$IFACE.setBrightness" "$value" >/dev/null
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echo "brightness: ${new_pct}% ($value/$max)"
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;;
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*)
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echo "usage: gui_brightness [get|set <percent>|up [step]|down [step]]" >&2
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echo "" >&2
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echo " get - show current brightness as percentage" >&2
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echo " set <0-100> - set brightness to percentage" >&2
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echo " up [step] - increase by step% (default 10)" >&2
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echo " down [step] - decrease by step% (default 10)" >&2
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exit 1
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;;
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esac
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