I've set up linux-crashdump to debug issues with lockups by following the instructions here: https://help.ubuntu.com/12.04/serverguide/kernel-crash-dump.html
However, when I try to test using:
echo c > /proc/sysrq-trigger, my screen just goes blank. This happens if I'm in X or even if I'm in VT1. Does it have to do with the fact that my VT is in framebuffer mode? When I try the crash I have no idea if the dump is working or if my system is just frozen.
When a crash does occur, I'd like to have some indication that something is still going on. Is there a way to configure kcrash to switch to a non-framebuffer VT when dumping? Or is this technically impossible?