vowstar@gmail.com Huang Rui fake-battery-nut bridges a UPS monitored by NUT (Network UPS Tools) into a virtual laptop battery. A small kernel module exposes BAT0 and AC0 devices under /sys/class/power_supply, and a userspace daemon polls upsc and feeds charge, runtime, voltage and status into the module through /dev/fake_battery_nut. UPower and desktop environments such as KDE and GNOME then show the UPS as a battery and can react to low-power events. fake-battery-nut 把由 NUT（Network UPS Tools）监控的 UPS 伪装成一块虚拟 笔记本电池。内核模块在 /sys/class/power_supply 下创建 BAT0 与 AC0 设备， 用户态守护进程轮询 upsc，并通过 /dev/fake_battery_nut 把电量、剩余时间、 电压和状态写入模块。这样 UPower 以及 KDE、GNOME 等桌面环境就能把 UPS 当作电池显示，并在低电量时触发相应的电源管理动作。 aaronsb/fake-battery-nut https://github.com/aaronsb/fake-battery-nut/issues