From http://blog.kember.net/articles/reisub-the-gentle-linux-restart/ -
https://en.wikipedia.org/wiki/Magic_SysRq_key
says that on linux mint, it is Ctrl Alt PrtScr, and then - slowly -
Alt + REISUO to shut down, REISUB to reboot.
- Switch from RAW to XLATE
- Send Sigterm
- Send Sigkill
- Sync all mounted filesystems
- remount in read-only
- Shutdown.
Running Linux Mint 20 on a Lenovo B460 laptop, on hitting Ctrl Alt F2 and seeing the 2nd terminal,
R
E
I
show "This SysReq is disabled."
has details on the bitmask etc.
cat /proc/sys/kernel/sysrq
"0 - disable every SysRq function.
1 - enable every SysRq function.
2 - enable control of console logging level
4 - enable control of keyboard (SAK, unraw)
8 - enable debugging dumps of processes etc.
16 - enable sync command
32 - enable remount read-only
64 - enable signalling of processes (term, kill, oom-kill)
128 - allow reboot/poweroff
256 - allow nicing of all RT tasks
438 = 2 + 4 + 16 + 32 + 128 + 256, so only the functions associated with those numbers are allowed. Read all about it in the documentation."
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