Description of problem:
Cannot configure dual head on Dell D620 notebook

Version-Release number of selected component (if applicable):
system-config-display-1.0.51-1.fc7

How reproducible:
Always

Steps to Reproduce:
1. Boot the KDE F7t4 CD
2. run system-config-display from konsole
3. On the Dual head tab, check Use dual head
4. set the second monitory type to LCD panel 1600x1200
5. (set resolution to match)
6. click OK
  
Actual results:
Traceback
  File "/usr/share/system-config-display/xConfigDialog.py", line 137, in ok
    lower_vrefresh, upper_vrefresh =
string.split(str(self.second_monitor_vrefresh), "-")
ValueError: need more than 1 value to unpack

Expected results:
No traceback, and a properly configured dual-head setup.

Additional info:
Intel integrated graphics controller