How to debug resume (suspend) problems?

[Felix Schwarz]

Hi,

I'm using F13 x86_64 on a Dell Vostro 1500 laptop and with the last 
kernels in F13, I have the problem that my laptop does not properly 
resume from sleep. Most of the time, I just see the "blue screen" with 
the fedora logo but nothing happens afterwards...

This happens not always but most of the time (~ 80%). No lines in the 
system, the system is just "dead". Kernel is not tainted...

How can I debug that? I think before opening a bz report, I first need 
to gather some data but how?
fs