Thanks but unfortunately that's still missing any evidence of what has
hung. Please remember step 1 in comment #4 which is "Wait 10 seconds"
before rebooting. It may also help to use this to reboot:
Alt + PrtScn + {R,E,I,S,U,B}
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https://bugs.launchpad.net/bugs/1941030
Title:
[Fujitsu Lifebook U7411] Screen Flickers
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