On most occasions when I 'shut down' or restart Linux, things do not happen as expected. Instead I get a black screen with white text indicating that Linux is still trying to kill off some processes. The system never recovers from this, so I manually turn off the computer with the power switch.
Is there any way to find a log file of these errors to share with you? I have spotted some (possibly) pertinent information including:
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Watchdog detected HARD lockup on CPU 0
Pulseaudio is also being mentioned as a possible cause for the fault.
Let me know if this is an issue, and how I can help you diagnose the problem.