Hello Peter: This looks like a video driver/mesa problem. I bet you are using 3d screensavers. What video card and video driver/mesa versions have you installed? Could you try to reproduce after having installed libgl1-mesa-glx-dbg and your video card xorg driver -dbg packages? Regards -- Raúl Sánchez Siles ----->Proud Debian user<----- Linux registered user #416098
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