If i run lspci | grep VGA I get below output which tells me below VGA cards are present on my computer.

01:00.0 VGA compatible controller: nVidia Corporation GT216 [GeForce GT 220] (rev a2) 08:02.0 VGA compatible controller: ATI Technologies Inc ES1000 (rev 02)

The ES1000 is an onboard card which came with my machine. Do anyone know how to disable this VGA on my machine.

The reason for this request is because if I run xrandr I get the output as shown below:

xrandr: Failed to get size of gamma for output default Screen 0: minimum 320 x 240, current 1024 x 768, maximum 1024 x 768 default connected 1024x768+0+0 0mm x 0mm 1024x768 50.0* 800x600 51.0 52.0 53.0
680x384 54.0 55.0
640x480 56.0
512x384 57.0
400x300 58.0
320x240 59.0

Which means I am not able to configure nVidia to accept smaller resolution.

Thank you.