I have a laptop with Ubuntu 20.04.2 LTS, 64 bit.
From some time now, it suffers from inexplicable crashes. At random time, without any heads-up or warnings, the audio stops, the screen gets black, the keyboard doesn't work anymore and I lose ANY kind of control over the laptop. Yet, the leds are still on, showing the laptop is still running... something. Waiting doesn't solve it, nor closing the screen.
Alt-Stamp-K or (Ctrl-)Alt-F* have no effect whatsoever, just like any other combinations of keys, and all I can do is wait for the battery to drain, or long press the power button to kill it.
I have also temperature control on, but it doesn't seem to be correlated. The only common thing to all crashes was that I had Chrome open, but that may be because I always have chrome open...
My plan is, at the next crash, to annotate the exact time at which it happens. What I am asking, is: where can I find logs/recordings/a djinn that tells me what the artichoke is going on in the pc while it is crashing, what are the causes of the crash, and that I can consult when I restart?