XFree86-Video-Timings-HOWTO.pdf

XFree86 Video Timings HOWTO

Table of Contents

XFree86 Video Timings HOWTO. ....................................................................................................................1

Eric Steven Raymond. .............................................................................................................................1

1. Disclaimer. .......................................................................................................................................................3

2. Introduction. ....................................................................................................................................................4

3. Tools for Automatic Computation. ...............................................................................................................5

4. How Video Displays Work. ............................................................................................................................6

5. Basic Things to Know about your Display and Adapter. ............................................................................8

5.1. The monitor sync frequencies. ..........................................................................................................8

5.2. The monitor's video bandwidth.. .......................................................................................................8

5.3. The card's dot clock. .........................................................................................................................9

5.4. What these basic statistics control. .................................................................................................11

6. Interpreting the Basic Specifications. .........................................................................................................12

6.1. About Bandwidth. ...........................................................................................................................13

6.2. Sync Frequencies and the Refresh Rate. ........................................................................................13

7. Tradeoffs in Configuring your System. ......................................................................................................15

8. Memory Requirements. ................................................................................................................................16

9. Computing Frame Sizes ...............................................................................................................................17

10. Black Magic and Sync Pulses. ....................................................................................................................18

10.1. Horizontal Sync:. ..........................................................................................................................18

10.2. Vertical Sync.. ..............................................................................................................................19

11. Putting it All Together. ...............................................................................................................................22

12. Overdriving Your Monitor. .......................................................................................................................24

13. Using Interlaced Modes. .............................................................................................................................25

14. Questions and Answers. ..............................................................................................................................27

15. Fixing Problems with the Image.. ..............................................................................................................29

15.1. The image is displaced to the left or righ. ....................................................................................29

15.2. The image is displaced up or down. ..............................................................................................29

15.3. The image is too large both horizontally and vertically. ..............................................................29

15.4. The image is too wide (too narrow) horizontally. .........................................................................30

15.5. The image is too deep (too shallow) vertically. ............................................................................30

16. Plotting Monitor Capabilities ....................................................................................................................31

XFree86 Video Timings HOWTO

Table of Contents

17. Credits. .........................................................................................................................................................35

XFree86 Video Timings HOWTO

Eric Steven Raymond

Thyrsus Enterprises

esr@thyrsus.com

This is version 5.0

$Date: 2000/08/22 02:26:20 $

Revision History

Revision 5.0

21 August 2000

Revised by: esr

First DocBook version.

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.

Table of Contents

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

XFree86 Video Timings HOWTO

XFree86 Video Timings HOWTO

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

XFree86 Video Timings HOWTO

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