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Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 16
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSectionIn this example, a color depth of thousands of colors and a resolution of
1024768 is the default, with optional resolutions of 800 × 600 and 64 × 480.
Multiple Display subsection entries with different color depths and
resolutions (with settings such as Depth 24 for millions of colors) can be used
if supported by the graphics card and monitor combination. You can also use
a DefaultDepth entry (which is 24, or thousands of colors, in the
example), along with a specific color depth to standardize display depths in
installations.
You can also specify a desktop resolution larger than that supported by the
hardware in your monitor or notebook display. This setting is known as a
virtual resolution in the Display subsection. This allows, for example, an
800 × 600 display to pan (that is, slide around inside) a virtual window of
1024 × 768.
NOTE
If your monitor and graphics card support multiple resolutions and the
settings are properly configured, you can use the key combination
Ctrl+Alt+(Keypad)+ or Ctrl+Alt+(Keypad)- to change resolutions on-the-
fly during your X session.Starting X
You can start X sessions in a variety of ways. The Ubuntu installer sets up the
system to have Linux boot directly to an X session using a display manager
called LightDM, for Light(weight) Display Manager. This is an X client that
provides a graphical login. After you log in, you use a local session (running
on your computer) or, if the system is configured to do so, an X session
running on a remote computer on the network.
If you log in via a display manager, you must enter a username and password.