I'm using the ati opensource drivers in Karmic (xserver-xorg-video-ati_6.12.99+git20090629.f39cafc5-0ubuntu5_i386.deb), though AFAIR the problem was also there using nvidia proprietary drivers (but I'll also post the results with them when I can).
More interesting would be what driver you're running that don't show the behavior.
I'm using the ati opensource drivers in Karmic (xserver- xorg-video- ati_6.12. 99+git20090629. f39cafc5- 0ubuntu5_ i386.deb) , though AFAIR the problem was also there using nvidia proprietary drivers (but I'll also post the results with them when I can).
More interesting would be what driver you're running that don't show the behavior.