Created attachment 603628 [details]
crash log generated by abrt with pasted-in backtrace

Description of problem:
After an otherwise successful suspend-to-ram/resume cycle, the X server crashes.  Usually not immediately (but once it did), but after a while.  I haven't seen the crash happen yet without suspend/resume.
This happens since the latest kernel update (to 3.5.0-2.fc17.x86_64).
The last time, I just opened a web page in firefox, but I don't think firefox is always involved (it is always running, though).
After the crash, the server won't come up again.  Instead I see messages like
Failed to idle channel 3.
on an otherwise black screen, and sometimes a very distorted image, but only for a few seconds.

Version-Release number of selected component (if applicable):
kernel-3.5.0-2.fc17.x86_64
xorg-x11-server-Xorg-1.12.2-4.fc17.x86_64

How reproducible:
So far, close to 100%.

Steps to Reproduce:
1.boot
2.suspend-to-ram
3.resume
4.work normally
  
Actual results:
Mouse cursor freezes, then screen goes black.  Messages start appearing on the black screen.

Expected results:
No crash.

Additional info:
I was unable to use the ABRT tool since for some reason it couldn't generate a backtrace, and it didn't accept the backtrace I pasted in.  Instead I save the crash report on file and attach it here.