联想ThinkPad P14运行Kubuntu 22.04无法正常关机/重启的问题求助

大家好，我刚入手一台全新的Lenovo ThinkPad P14，配置是13代Intel Core i7-1370P处理器+64GB内存，目前装的是Kubuntu 22.04，Secure Boot已经关闭。

系统安装过程很顺利，日常启动也没什么问题，但关机/重启的时候完全不正常——触发关机后，正常的流程走完，笔记本会卡在联想的开机 splash 界面不动，我只能长按电源键20秒强制关机。

我查了系统日志，没发现明显错误，运行journalctl -b-1得到的最后输出如下：

Aug 29 12:08:23 william-thinkpad systemd[1]: Reached target Unmount All Filesystems.
Aug 29 12:08:23 william-thinkpad systemd[1]: systemd-fsck@dev-disk-by\x2duuid-38bc426c\x2dd0a0\x2d48d4\x2d8529\x2dded397feafaf.service: Deactivated successfully.
Aug 29 12:08:23 william-thinkpad systemd[1]: Stopped File System Check on /dev/disk/by-uuid/38bc426c-d0a0-48d4-8529-ded397feafaf.
Aug 29 12:08:23 william-thinkpad systemd[1]: Removed slice Slice /system/systemd-fsck.
Aug 29 12:08:23 william-thinkpad systemd[1]: Stopped target Preparation for Local File Systems.
Aug 29 12:08:23 william-thinkpad systemd[1]: systemd-tmpfiles-setup-dev.service: Deactivated successfully.
Aug 29 12:08:23 william-thinkpad systemd[1]: Stopped Create Static Device Nodes in /dev.
Aug 29 12:08:23 william-thinkpad systemd[1]: systemd-sysusers.service: Deactivated successfully.
Aug 29 12:08:23 william-thinkpad systemd[1]: Stopped Create System Users.
Aug 29 12:08:23 william-thinkpad systemd[1]: systemd-remount-fs.service: Deactivated successfully.
Aug 29 12:08:23 william-thinkpad systemd[1]: Stopped Remount Root and Kernel File Systems.
Aug 29 12:08:23 william-thinkpad systemd[1]: Reached target System Shutdown.
Aug 29 12:08:23 william-thinkpad systemd[1]: Reached target Late Shutdown Services.
Aug 29 12:08:23 william-thinkpad systemd[1]: systemd-poweroff.service: Deactivated successfully.
Aug 29 12:08:23 william-thinkpad systemd[1]: Finished System Power Off.
Aug 29 12:08:23 william-thinkpad systemd[1]: Reached target System Power Off.
Aug 29 12:08:23 william-thinkpad systemd[1]: Shutting down.
Aug 29 12:08:23 william-thinkpad systemd-shutdown[1]: Syncing filesystems and block devices.
Aug 29 12:08:23 william-thinkpad systemd-shutdown[1]: Sending SIGTERM to remaining processes...
Aug 29 12:08:23 william-thinkpad systemd-journald[440]: Journal stopped

另外/var/log/syslog的结尾内容是：

Aug 29 12:08:21 william-thinkpad systemd[1]: Stopping Bluetooth service...
Aug 29 12:08:21 william-thinkpad systemd[1]: Stopping Thunderbolt system service...
Aug 29 12:08:21 william-thinkpad systemd[1]: Stopping Regular background program processing daemon...
Aug 29 12:08:21 william-thinkpad systemd[1]: Stopping Make remote CUPS printers available locally...
Aug 29 12:08:21 william-thinkpad systemd[1]: Stopping irqbalance daemon...
Aug 29 12:08:21 william-thinkpad systemd[1]: Stopping Tool to automatically collect and submit kernel crash signatures...
Aug 29 12:08:21 william-thinkpad systemd[1]: Stopping Dispatcher daemon for systemd-networkd...
Aug 29 12:08:21 william-thinkpad systemd[1]: Stopping PackageKit Daemon...
Aug 29 12:08:21 william-thinkpad systemd[1]: Stopping Power Profiles daemon...

现在我完全摸不着头绪，不知道该从哪里入手排查这个问题。有没有朋友遇到过类似情况，或者能给我一些排查方向的？非常感谢大家的帮助！

备注：内容来源于stack exchange，提问作者William