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XFree86-Video-Timings-HOWTO

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XFree86 Video Timings HOWTO

Eric S. Raymond <esr@thyrsus.com>

Version 4.4, 13 Mar 2000

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How to compose a mode line for your card/monitor combination under XFree86. The XFree86 distribution now includes good facilities for configuring most standard combinations; this document is mainly useful if you are tuning a custom mode line for a high-performance monitor or very unusual hardware. It may also help you in using kvideogen to generate mode lines, or xvidtune to tweak a standard mode that is not quite right for your monitor.

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1. Disclaimer

2. Introduction

3. Tools for Automatic Computation

4. How Video Displays Work

5. Basic Things to Know about your Display and Adapter

• 5.1 The monitor sync frequencies
• 5.2 The monitor's video bandwidth
• 5.3 The card's dot clock
• 5.4 What these basic statistics control

6. Interpreting the Basic Specifications

• 6.1 About Bandwidth
• 6.2 Sync Frequencies and the Refresh Rate:

7. Tradeoffs in Configuring your System

8. Memory Requirements

9. Computing Frame Sizes

10. Black Magic and Sync Pulses

• 10.1 Horizontal Sync:
• 10.2 Vertical Sync:

11. Putting it All Together

12. Overdriving Your Monitor

13. Using Interlaced Modes

14. Questions and Answers

15. Fixing Problems with the Image.

• 15.1 The image is displaced to the left or right
• 15.2 The image is displaced up or down
• 15.3 The image is too large both horizontally and vertically
• 15.4 The image is too wide (too narrow) horizontally
• 15.5 The image is too deep (too shallow) vertically

16. Plotting Monitor Capabilities

17. Credits

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