How to find information on a total system freeze

On a couple of occassions, my Librem 13v2 has frozen; it seems to happen when I watch videos (whether online, or saved on my own hard drive). Trying Ctrl + Alt + Backspace did nothing (I have not tried the magical “REIUSB”; whenever it happens, I forget the whole key combination). So, I want to try to troubleshoot this, but I’m not sure where the logs are for this sort of thing.

Or, if anyone has an ideas of the cause, I would appreciate them.

It looks like it’s an issue with how the Intel CPU’s power state is managed:

yes, wc to the club @ezs777, please do post your observations on the thread so as to push it back to the top of the list. Ping @mladen too so we can get some official feedback from Purism.

@Caliga’s post is interesting to probe the issue further.
Do read @Asmadeus posts as he had done some interesting experimentations.