May I introduce myself?

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How to take a screenshot if the whole system freezes? there is also nothing interesting to see, just the game itself that froze at one frame.
I don't know if I can still get to tty1(Crtl-alt-F1), but I doubt this would be useful.
Does the game write chrash logs? Or, does my system write logs that might be useful for this problem? I know system log tools exist, but I've not looked much into it yet.