Desktop effects: solid white screen

[Clyde E. Kunkel]

When I enable desktop effects in current rawhide, all I get is a solid 
white screen.  c-a-bs or <enter> gets me out.

How do I fix this?

01:00.0 VGA compatible controller: ATI Technologies Inc RV630 [Radeon HD 
2600 Series]

same result using radeonhd driver.

device section of xorg.conf:

Section "Device"
	Identifier  "Videocard0"
	Option          "AccelMethod" "EXA"
         Option          "MigrationHeuristic" "greedy"
EndSection


Any ideas or suggestions?