Not fully supported graphics card

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Not fully supported graphics card

Sometimes one may purchase a new graphics card or complete system where graphics card is not supported by installed OS. In such cases one can install Cent-OS by choosing "Generic display driver" called vesa. To use generic display driver on a already running machine use following steps:

1. Boot into single user mode
2. Use command 'Xorg -configure' to create a 'xorg.conf.new' file in '/root' folder.
3. If old graphics were working fine then take backup of '/etc/X11/xorg.conf' file appropriately.
4. Replace '/etc/X11/xorg.conf' file with newly generated 'xorg.conf.new' file and restart the machine in run level 5.
5. If things do not work then restart in single mode and edit the '/etc/X11/xorg.conf' file and replace all Driver lines with 'Driver "vesa"'
6. Again restart the machine and check if things work fine.

Adding more display modes

Sometimes Linux may not recognize all the different display modes that are supported by a Graphics Card. For example at time of this writing Cent-OS 6.3 recognizes only 1600x900 resolution on Dell latitude E6430 laptops with Intel HD Graphics 4000 on-board graphics card. To add more modes one can use 'xrandr' and 'cvt' commands to add more modes.

Display all connected devices

To see all connected devices use:

xrandr --verbose

command. This will list all the connected devices and their recognized supported modes. This can also be done using GUI accessible at "System -> Preferences -> Display (gnome-display-properties)".

Adding new mode

To add a new mode first a mode-line needs to be constructed. Use:

c