I am trying to setup my Samsung syncmaster B2030 monitor in ubuntu 12.04. It's native resolution is 1600x900 which I am not getting in ubuntu and which I am trying to get.

I tried using xrandr approach provided in these urls: 1) http://www.ubuntugeek.com/how-change-display-resolution-settings-using-xrandr.html 2) How to set the monitor to its native resolution which is not listed in the resolutions list?

S1) I used

cvt 1600 900 60

to get the modeline. Output was:

# 1600x900 59.95 Hz (CVT 1.44M9) hsync: 55.99 kHz; pclk: 118.25 MHz
Modeline "1600x900_60.00"  118.25  1600 1696 1856 2112  900 903 908 934 -hsync +vsync

S2) I then used

xrandr

and output was:

Screen 0: minimum 8 x 8, current 1152 x 864, maximum 8192 x 8192
DVI-I-0 disconnected (normal left inverted right x axis y axis)
VGA-0 connected 1152x864+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
1024x768       60.0 +
1360x768       60.0     59.8  
1152x864       60.0* 
800x600        72.2     60.3     56.2  
680x384       119.9    119.6  
640x480        59.9  
512x384       120.0  
400x300       144.4  
320x240       120.1  
DVI-I-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)

which gave me "VGA-0".

S3) Then I used

xrandr --newmode "1600x900_60.00"  118.25  1600 1696 1856 2112  900 903 908 934 -hsync +vsync

But instead of adding the modeline it just threw an error:

X Error of failed request:  BadName (named color or font does not exist)
  Major opcode of failed request:  153 (RANDR)
  Minor opcode of failed request:  16 (RRCreateMode)
  Serial number of failed request:  29
  Current serial number in output stream:  29

My system details:

1) ubuntu 12.04 LTS

2) Graphic card: GeForce 9400 GT/PCIe/SSE2 (driver is successfully installed. I am checking it in System Settings > Details. And it's showing that driver is installed and its "GeForce 9400 GT/PCIe/SSE2")

3) Monitor: Samsung syncmaster B2030

4) Resolutions I am getting:

800x600
1024x768
1152x864 (I am currently using this one)
1360x768 (this one isn't working properly)

Does anyone know what I can do?

Thanks in advance.

UPDATE (1):

Today I tried it again. And adding a modeline (using --newmode) worked. But when I used --addmode by:

xrandr --addmode VGA-0 1600x900_60.00

It gave this error:

X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  153 (RANDR)
  Minor opcode of failed request:  18 (RRAddOutputMode)
  Serial number of failed request:  29
  Current serial number in output stream:  30