I had to add the "FramebufferCompression" "off" to the monitor section (see below). While the issue sometimes only occurred when watching two videos in parallel and making some overly (KDE kicker tooltip) appear over them, it doesn't occur anymore even when watching 4 videos + overlay. IOW, issue closed for me. (Kubuntu 8.04.2 BTW)
I had to add the "FramebufferCom pression" "off" to the monitor section (see below). While the issue sometimes only occurred when watching two videos in parallel and making some overly (KDE kicker tooltip) appear over them, it doesn't occur anymore even when watching 4 videos + overlay. IOW, issue closed for me. (Kubuntu 8.04.2 BTW)
Section "Monitor" pression" "off"
Identifier "Configured Monitor"
Option "FramebufferCom
Option "Ignore" "false"
EndSection