update 20260413

power-management.md

@@ -0,0 +1,56 @@
+# Sway 电源自动管理配置
+
+## 功能说明
+
+实现 Sway 环境下根据电源状态自动切换性能模式：
+- **插电源**：`throughput-performance` (高性能)
+- **用电池**：`laptop-battery-powersave` (节能降频)
+
+仅在 Sway 会话生效，不影响 Plasma 的电源管理。
+
+## 实现方式
+
+### 1. 自动切换脚本
+`/usr/local/bin/tuned-auto-switch.sh`
+```bash
+#!/bin/bash
+# Only run if Sway is running
+pgrep -x sway > /dev/null || exit 0
+
+if [ "$(cat /sys/class/power_supply/AC*/online)" = "1" ]; then
+    tuned-adm profile throughput-performance
+else
+    tuned-adm profile laptop-battery-powersave
+fi
+```
+
+### 2. Systemd 服务
+`/etc/systemd/system/tuned-power-switch@.service`
+```ini
+[Unit]
+Description=Switch tuned profile on power change
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/bin/tuned-auto-switch.sh
+```
+
+### 3. Udev 规则
+`/etc/udev/rules.d/99-tuned-power.rules`
+```
+SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_ONLINE}=="0", TAG+="systemd", ENV{SYSTEMD_WANTS}="tuned-power-switch@$kernel.service"
+SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_ONLINE}=="1", TAG+="systemd", ENV{SYSTEMD_WANTS}="tuned-power-switch@$kernel.service"
+```
+
+## 验证
+
+查看当前配置：
+```bash
+tuned-adm active
+cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
+```
+
+监控切换日志：
+```bash
+journalctl -f
+```