diagnose cause for lock up / black screen

[Sven Semmler]

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In my post "[AMD/ATI] Carrizo (rev c5)" from today I make the assumption
that the black screen / lock up is connected to the graphics driver,
because that's what I have observed with other Linux distributions on
that machine.

However, I just realized that I have the same issue much less frequently
(~1/month) on my Intel-based computer running Qubes OS 3.2

So I would like to learn how to go about diagnosing such an issue...
which logs to look at? How can I see what happened just before the
lock up?

So with this post I am not asking for help with a specific issue on a
specific machine but general hints, links and references as to how one
goes about diagnosing / analyzing and eventually maybe reporting issues
with Qubes OS.

/Sven
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