Is bug 4989 blocker worthy?

[Pierre Ossman]

My personal opinion is that bug 4989 is a blocker bug, but I don't want 
to add it this late in the RC-process without some kind of OK.

 From the bug description:

Sometimes X locks up when I start it. It kills the radeon chip (bios 
post code needed to get the panel running again) and doesn't respond to 
the keyboard. It also consumes 100% cpu, all in user space. The log is 
full of:

(EE) RADEON(0): Idle timed out, resetting engine...

Rgds
Pierre