Happens also on my IBM Thinkpad T40.
ATI Technologies Inc Radeon RV250 [Mobility FireGL 9000] rev 2,
Reproduced with http://cdimage.ubuntu.com/daily-live/current/ 24-Sep-2010
Work-around: xrandr --output LVDS --mode 1400x1050
Happens also on my IBM Thinkpad T40.
ATI Technologies Inc Radeon RV250 [Mobility FireGL 9000] rev 2,
Reproduced with http:// cdimage. ubuntu. com/daily- live/current/ 24-Sep-2010
Work-around: xrandr --output LVDS --mode 1400x1050