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Article ID: 3986
Last update: 10-12-04
Issue:
The XFree86 configuration utility was unable to detect my monitor and now I cannot get a resolution greater than 640x480. How can I fix this in text mode without running X Windows?
Resolution:
You will need to know the horizontal and vertical refresh rates of the monitor. This can be found in the documentation that came with the monitor, as well as online at many manufacturers' websites. In the technical specifications section, look for two numbers representing the horizontal frequency range (in kHz) and two numbers representing the vertical frequency range (in Hz).

Next you will need to edit the file /etc/X11/XF86Config with any text editor. Under the section entitled "Monitor" make the following changes:
  • ModelName: Put the model information here. The formatting is irrelevant, as long as it is enclosed in double quotes.
  • HorizSync: Horizontal scan range of monitor (for example 30.0-85.0)
  • VertRefresh: Vertical scan range of monitor (for example 50.0-160.0)
Save this file. You should now be able to run redhat-config-xfree86 (the XFree86 configuration utility) and change the resolution to higher than 640x480.


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