Using Kde 4.12 on Suse 11.0; Nvidia 8800GT.

I have the screen set to blank after 20 minutes of inactivity. Throughout the day yesterday the screen blanked as it should and moving the mouse or tapping the spacebar brought the screen back up.

This morning I moved the mouse, the mouse cursor appeared over a black screen. The Kde desktop did not appear. I had to restart the X server to get back to my desktop.

I do not have the system set to sleep or hibernate.

Is there a tweak or setting to ensure that graphics are restored after screen blanking?