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I'm using Gentoo and I've carefully followed and triple-checked the instructions on the following page but the crash kernel will not boot so I don't get anything in /proc/vmcore:

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I'd add more info to clarify your question if possible. There's not much here to go on. – DanteTheEgregore Oct 5 '13 at 6:43
What happens when you try to boot it? – David Schwartz Oct 5 '13 at 7:43
I agree not much to go on. @david, when the system crashes it just locks up. From what I understand, it's supposed to automatically reboot into the crash kernel at that point. – stackoverflowrocks Oct 5 '13 at 11:58
How would you debug this if you found yourself in this situation? – stackoverflowrocks Oct 5 '13 at 14:41
up vote 0 down vote accepted

It turns out the crashkernel itself crashes when I have the Mini DisplayPort connected. I've filed a bug:

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