Screen Resolution 1440 x 900 in Ubuntu
Ubuntu 9.04 did not detect the native resolution of my new LCD monitor which was 1440 x 900.
Fix :
1. Get the modeline for the required resolution + refresh rate using the gtf command.
desktop:~$ gtf 1440 900 75 <span id="more-62"></span> # 1440x900 @ 75.00 Hz (GTF) hsync: 70.50 kHz; pclk: 136.49 MHz Modeline "1440x900_75.00" 136.49 1440 1536 1688 1936 900 901 904940 -HSync +Vsync
The modeline is to be added to the xorg.conf file at /etc/X11/xorg.conf
Take a backup of the file before editing it.
On a fresh Ubuntu installation the file may look small like this :
#Some comments on top Section "Monitor" Identifier "Configured Monitor" EndSection Section "Screen" Identifier "Default Screen" Monitor "Configured Monitor" Device "Configured Video Device" EndSection Section "Device" Identifier "Configured Video Device" EndSection Section "ServerFlags" Option "DontZap" "True" EndSection
Simply add the modeline to the monitor section like this :
Section "Monitor" Identifier "Configured Monitor" Modeline "1440x900_75.00" 136.49 1440 1536 1688 1936 900 901 904 940 -HSync +Vsync Option "PreferredMode" "1440x900_75.00" EndSection Section "Screen" Identifier "Default Screen" Monitor "Configured Monitor" Device "Configured Video Device" EndSection Section "Device" Identifier "Configured Video Device" EndSection Section "ServerFlags" Option "DontZap" "True" EndSection
The option “PreferredMode” “1440×900_75.00″ is used so that it becomes the default resolution on gnome, KDE desktops and GDM and KDM i.e. the login screen. If this option is not used then there may be issues such that resolution after reboot or relogin reverts to a default like 1280 x 1200 as discussed here Bug.
Another fix could to be reconfigure X like : sudo dpkg-reconfigure xserver-xorg.
References :
1. Ubuntu Resolution Configuration
2. Forum
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