最近（システムアップデート以降だと思います）、ノートブックカバーを閉じたまま一時停止した後、ノートブックは再起動されませんでした。普通しばらく止めた後、ふたを開けるとカーソルだけあり、黒い画面だけが出ますが、その他には何もありません。キーボードを使ってカーソルを移動したり、tty 端末を開くことはできません。これはいつも起こるわけではありませんが、いつ発生し、発生しないかについてのパターンが見つかりません。
最後に、これが発生したときのJournalctlログを見ると、ふたを再開しても信号は送信されませんでした。ふたを閉めた後からラップトップを再び閉じるまでのログは下に貼り付けました。
Jan 31 11:57:30 whiteboard kwin_x11[2134]: qt.qpa.xcb: QXcbConnection: XCB error: 8 (BadMatch), sequence: 42342, resource id: 60817415, major code: 42 (SetInputFocus), minor code: 0
Jan 31 11:57:30 whiteboard kwin_x11[2134]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 42489, resource id: 60817961, major code: 18 (ChangeProperty), minor code: 0
Jan 31 11:57:30 whiteboard kwin_x11[2134]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 42525, resource id: 46138526, major code: 18 (ChangeProperty), minor code: 0
Jan 31 11:57:34 whiteboard systemd-logind[1326]: Lid closed.
Jan 31 11:57:34 whiteboard org_kde_powerdevil[2302]: powerdevil: Suspend session triggered with QMap(("Explicit", QVariant(bool, true))("Type", QVariant(uint, 1)))
Jan 31 11:57:34 whiteboard org_kde_powerdevil[2302]: powerdevil: Suspend session triggered with QMap(("Explicit", QVariant(bool, true))("SkipFade", QVariant(bool, true))("Type", QVariant(uint, 1)))
Jan 31 11:57:34 whiteboard org_kde_powerdevil[2302]: powerdevil: Starting Login1 suspend job
Jan 31 11:57:34 whiteboard org_kde_powerdevil[2302]: powerdevil: Pausing all media players before suspending
Jan 31 11:57:34 whiteboard kdeinit5[1991]: bluedevil: About to suspend
Jan 31 11:57:34 whiteboard ksmserver[2059]: lock called
Jan 31 11:57:34 whiteboard NetworkManager[1473]: <info> [1548961054.9755] manager: sleep: sleep requested (sleeping: no enabled: yes)
Jan 31 11:57:34 whiteboard NetworkManager[1473]: <info> [1548961054.9758] device (enp0s31f6): state change: unavailable -> unmanaged (reason 'sleeping', sys-iface-state: 'managed')
Jan 31 11:57:34 whiteboard ksmserver[2059]: Lock window Id: 23068678
Jan 31 11:57:34 whiteboard ksmserver[2059]: CreateNotify: 23068678
Jan 31 11:57:34 whiteboard ksmserver[2059]: CreateNotify: 23068680
Jan 31 11:57:35 whiteboard ksmserver[2059]: CreateNotify: 60817412
Jan 31 11:57:35 whiteboard kscreenlocker_greet[4307]: Qt: Session management error: networkIdsList argument is NULL
Jan 31 11:57:35 whiteboard NetworkManager[1473]: <info> [1548961055.1785] manager: NetworkManager state is now ASLEEP
Jan 31 11:57:35 whiteboard ksmserver[2059]: CreateNotify: 60817416
Jan 31 11:57:35 whiteboard kernel: e1000e: enp0s31f6 NIC Link is Down
Jan 31 11:57:35 whiteboard ksmserver[2059]: CreateNotify: 60817424
Jan 31 11:57:35 whiteboard ksmserver[2059]: CreateNotify: 60817429
Jan 31 11:57:35 whiteboard kscreenlocker_greet[4307]: Icon theme "ubuntu-mono-dark" not found.
Jan 31 11:57:35 whiteboard kscreenlocker_greet[4307]: Icon theme "gnome" not found.
Jan 31 11:57:35 whiteboard ksmserver[2059]: CreateNotify: 60817431
Jan 31 11:57:35 whiteboard ksmserver[2059]: CreateNotify: 60817433
Jan 31 11:57:35 whiteboard ksmserver[2059]: MapNotify: 60817431
Jan 31 11:57:35 whiteboard ksmserver[2059]: CreateNotify: 60817435
Jan 31 11:57:35 whiteboard kscreenlocker_greet[4307]: UdevQt: unable to create udev monitor connection
Jan 31 11:57:35 whiteboard ksmserver[2059]: CreateNotify: 60817444
Jan 31 11:57:36 whiteboard kscreenlocker_greet[4307]: Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
Jan 31 11:57:37 whiteboard ksmserver[2059]: MapNotify: 23068678
Jan 31 11:57:37 whiteboard systemd[1]: Reached target Sleep.
Jan 31 11:57:37 whiteboard systemd[1]: Starting Suspend...
Jan 31 11:57:37 whiteboard systemd-sleep[4318]: INFO: Skip running /usr/lib/systemd/system-sleep/grub2.sleep for suspend
Jan 31 11:57:37 whiteboard systemd-sleep[4318]: Suspending system...
これはOpenSUSE Tumbleweedカーネルバージョンです4.20.2-1-default。