On 14/02/2020 13:21, David Kastrup wrote:
I think there are some emergency SysReq key
combinations. No idea
whether they need some special enabling. They bypass user space and
might be worth a try for getting a somewhat more regular shutdown.
Alt + SysReq + REISUB (aka "Reboot Even If System Utterly Broken")
should reboot the machine.
On some distributions I think you need to actually enable it. [0]
Also there's a quite authoritative comment about the fact that 'S' and
'U' should not be recommended any more on 'modern' systems [1][2] and
that it should now be 'REIB' (Reboot Even If Broken)
[0]