Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free, no registration required.

I have dual monitor setup with Ubuntu 12.04 but the monitor that is connected via DVI has some resolutions that are not proper (the proper resolution is 1440x900) and in the display settings it is marked as unknown, but it works fine with the VGA connected monitor which works perfectly with 1440x900. the resolution that I am using now for the DVI monitor is 1152x864. Both monitors are ASUS same version.

the xorg.conf file is like this:

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 304.88  (buildmeister@swio-display-x86-rhel47-14)  Wed Mar 27 15:36:45 PDT 2013

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"

Section "Files"

Section "InputDevice"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"

and here whats xrandr is showing:

Screen 0: minimum 8 x 8, current 2592 x 900, maximum 8192 x 8192
DVI-I-0 connected 1152x864+1440+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  
VGA-0 connected 1440x900+0+0 (normal left inverted right x axis y axis) 410mm x 260mm
   1440x900       59.9 +   75.0* 
   1280x1024      75.0     60.0  
   1280x960       60.0  
   1280x800       74.9     59.8  
   1152x864       75.0  
   1024x768       75.0     70.1     60.0  
   800x600        75.0     72.2     60.3     56.2  
   640x480        75.0     72.8     59.9  
DVI-I-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)

I tried adding the mode manually but I get this error:

xrandr --addmode DVI-I-0 1440x900_60.00
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  18 (RRAddOutputMode)
  Serial number of failed request:  31
  Current serial number in output stream:  32

my GPU is: GeForce 9500 GT

share|improve this question
add comment

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.