Same problem in Sony Vaio VGN-FZ31E
Nvidia GeForce 8400M
Kubuntu 12.10 upgraded from 12.04
$ xrandr
Screen 0: minimum 8 x 8, current 1280 x 800, maximum 8192 x 8192
VGA-0 disconnected (normal left inverted right x axis y axis)
TV-0 disconnected (normal left inverted right x axis y axis)
LVDS-0 connected 1280x800+0+0 (normal left inverted right x axis y axis) 322mm x 201mm
1280x800 59.9*+
HDMI-0 disconnected (normal left inverted right x axis y axis)
Have tested driver in official Ubuntu repos and stable and beta official driver from Nvidia.
Same problem in Sony Vaio VGN-FZ31E
Nvidia GeForce 8400M
Kubuntu 12.10 upgraded from 12.04
$ xrandr
Screen 0: minimum 8 x 8, current 1280 x 800, maximum 8192 x 8192
VGA-0 disconnected (normal left inverted right x axis y axis)
TV-0 disconnected (normal left inverted right x axis y axis)
LVDS-0 connected 1280x800+0+0 (normal left inverted right x axis y axis) 322mm x 201mm
1280x800 59.9*+
HDMI-0 disconnected (normal left inverted right x axis y axis)
Have tested driver in official Ubuntu repos and stable and beta official driver from Nvidia.