When I start LFS I only get the following message

"Could not find suitable screen mode"

After updating to U19 the message changed to

"Propable error in graphics driver"

My Graphic Card is a Radeon 9550.
Drivers are new.
My Resolution is 1280x1024 an the Scrren runs with 75Hz.

Anybody any idea what to do?

Greets

Utze