[gentoo-user] Unable to catch kernel crash dump

[Grant]

I've been getting a kernel oops for awhile that is worse than ever in
3.11.1.  It seems to be related to my XHCI USB port.  I followed the
instructions here:

http://wiki.gentoo.org/wiki/Kernel_Crash_Dumps

but /proc/vmcore doesn't exist after I reboot the system after a
crash.  I did notice that I was getting a lot of white text dumped to
the screen against a black background before I followed the
instructions in the wiki, but after following them the screen just
freezes when it crashes.

Does anyone know what I might be doing wrong or how to find out?

- Grant