我在 Dell XPS 15 上安装了 Ubuntu 17.10，使用 Nvidia 专有驱动程序 (384.98)。关机过程有时可能需要长达十分钟，有时根本不会关机。
我使用相机记录了关机消息，因为我在日志中看不到任何内容：
wlp2s0: deauthenticating from 90:21:06:96:c2:d1 by local choice (Reason: 3=DEAUTH_LEAVING)
systemd-shutdow: 33 output lines suppressed due to ratelimiting
systemd-shutdown[1]: Sending SIGTERM to remaining processes...
systemd-journald[332]: Received SIGTERM from PID 1 (systemd-shutdow).
systemd-shutdown[1]: Sending SIGKILL to remaining processes...
systemd-shutdown[1]: Unmounting file systems.
systemd-shutdown[1]: Remounting '/' read-only with options 'errors=remount-ro,data=ordered'.
EXT4-fs (nvme0n1p1): remounted. Opts: errors=remount-ro,data=ordered
systemd-shutdown[1]: Remounting '/' read-only with options 'errors=remount-ro,data=ordered'.
EXT4-fs (nvme0n1p1): remounted. Opts: errors=remount-ro,data=ordered
systemd-shutdown[1]: All filesystems unmounted.
systemd-shutdown[1]: Deactivating swaps.
systemd-shutdown[1]: All swaps deactivated.
systemd-shutdown[1]: Detaching loop devices.
systemd-shutdown[1]: All loop devices detached.
kvm: exiting hardware virtualization
psmouse serio1: Failed to disable mouse on isa0060/serio1
reboot: Restarting system
reboot: machine restart
ACPI MEMORY or I/O RESET_REG.
在 wlp2s0 取消身份验证后会出现严重挂起，并且第一个 systemd-shutdow 消息最多需要 10 分钟才会出现。
这是 systemd 的问题吗？什么原因导致 33 条输出行被抑制？