It sounds like something the session lock protocol can be used for
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Cake day: July 16th, 2025
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There is https://en.wikipedia.org/wiki/Magic_SysRq_key but I’ve had some hit and miss success in actually getting it to work.
Normally I first try see if it is only the graphical interface that has crashed by pushing ctrl+alt+F1 or F2 or F3 to try and switch to another terminal. If I can switch, I log in and reboot or restart the window manager.
I also try SSH into the machine if I have another of around.
If I do reboot, then I use ‘journalctl -b-1 -e’ to see what happened at the time the system froze.
I’ve used a registry editor on Linux before to pull the Bluetooth pairing keys off my Windows partition so I could add them to my Linux Bluetooth config so the Bluetooth device would work on both systems.