[CentOS] How/when to file bugs on upstream bugzilla?

I've hit a bug since upgrading from 5.1 to 5.2 that involves the screen 
blanking when I shut the lid on a Dell Latitude D820 notebook.  It 
doesn't come back on correctly when I open the lid, and instead crashes 
X.  I've filed a bug on bugs.centos.org that describes the problem 
(#2910), and was requested to file a bug on bugzilla.redhat.com.

I've filed bugs on Red Hat's system before, but always after reproducing 
the problem using genuine RHEL.  In this case, I can't practically 
reload my notebook with RHEL 5.2, so I'm wondering how to report this 
bug to Red Hat.  I'm afraid of it getting rejected outright since it's 
not RHEL, but on the other hand I could see where the collected 
information could be useful to them if the bug report is written well...

Any advice on this?  I didn't see anything on the CentOS wiki or FAQ as 
to how or when to use upstream's bug system.

thanks!
Greg