12.2 locked and suspended?

[Andrea Venturoli]

Hello.

A server I manage, running 12.2/amd64, locked on Friday.
The logs just end abruptly and an hardware reset was required.

So far it seems like a deadlock, but what I find strange is the power 
light blinking, as if the computer had entered power saving.

BIOS is set up to never enter suspension and powerd is not running.
I doubt anyone did mess physically with the box and, in any case, power 
button should shutdown, not suspend.

So far I have no idea... I'll try enabling some debugging feature in the 
kernel, but I had never seen such a behaviour before.
Any hint?
Any other reason the power light would blink?

  bye & Thanks
	av.