I have beryl running with nvidia prop. drivers with the following options: beryl --use-cow --force-aiglx --skip-gl-yield There are now problems with black windows etc... that may appear with other options. The X server is running with increased priority (set by using schedtool), so there responsiveness is good running tvtime smoothly even under system load. There is one small issue however: Before a menu window is filled with content, there may appear some artifacts in the window background. These disappear if I use the --force-nvidia option, but then UI responsiveness is distintively slower and tvtime does not run smoothly anymore. Is this is a known issue? -- Gérard Milmeister Langackerstrasse 49 CH-8057 Zürich