Comment 15 for bug 175774

I've looked at the drawing-artefact of the shadow and my best guess is that it is a texture-coordinate mixup of the XRender-related EXA-drawing. It looks like some texture-coordinate "index" is offset by one in regards to the corresponding quad-vertex. Each shadow-texture is turned clock-wise by 90 degrees.

What could be the cause for the window-border itself to be messed up I currently do not know.

That's the best hint I can give right now to anyone being more familiar with the codebase of intel's driver.