Kann mir jemand die Woody leihen? Ich möchte sie gerne probieren. (evtl.
morgen mitbringen)


Weis nicht mehr wer mich gefragt hat wie man seinen Monitor unter Xfree
konfiguriert. Egal hier die Theorie :slight_smile:

  1. Introduction

  Please direct comments, criticism, and suggestions for improvement to

  The XFree86 server allows users to configure their video subsystem and
  thus encourages best use of existing hardware. This tutorial is
  intended to help you learn how to generate your own timing numbers to
  make optimum use of your video card and monitor.

  We'll present a method for getting something that works, and then show
  you how you can experiment starting from that base to develop settings
  that optimize for your taste.

  If you already have a mode that almost works (in particular, if one of
  predefined VESA modes gives you a stable display but one that's
  displaced right or left, or too small, or too large) you can go
  straight to the section on Fixing Problems. This will enlighten you
  on ways to tweak the timing numbers to achieve particular effects.

  XFree86 allows you to hot-key between different modes defined in
  XF86Config (see XF86Config.man for details). Use this capability to
  save yourself hassles! When you want to test a new mode, give it a
  unique mode label and add it to the end your hot-key list. Leave a
  known-good mode as the default to fall back on if the test mode
  doesn't work. The Xconfig section at the end of the second Example
  Calculation provides a good example of how to record your experiments
  in a way that will help you quickly converge on a solution.

  First check out the Monitors file in lib/X11/doc If your monitor is in
  it, you can probably skip the rest of this document! You may need to
  scale some of the timing numbers if the clock used to generate the
  mode in the database doesn't match what your card has available, but
  that's easy.

  2. How Video Displays Work

  Knowing how the display works is essential to understanding what
  numbers to put in the various fields in the file Xconfig. Those
  values are used in the lowest levels of controlling the display by the
  XFree86 server.

  The display generates a picture from a series of dots. The dots are
  arranged from left to right to form lines. The lines are arranged
  from top to bottom to form the picture. The dots emit light when they
  are struck by the electron beam inside the display. To make the beam
  strike each dot for an equal amount of time, the beam is swept across
  the display in a constant pattern.

  The pattern starts at the top left of the screen, goes across the
  screen to the right in a straight line, and stops temporarily on the

    1. (from an original by Chin Fang

  fangchin(a)leland.stanford.edu; portions derive from a how-

  to by Bob Crosson crosson(a)cam.nist.gov,
  right side of the screen. Then the beam is swept back to the left
  side of the display, but down one line. The new line is swept from
  left to right just as the first line was. This pattern is repeated
  until the bottom line on the display has been swept. Then the beam is
  moved from the bottom right corner of the display to the top left
  corner, and the pattern is started over again.

  Starting the beam at the top left of the display is called the
  beginning of a frame. The frame ends when the beam reaches the the
  top left corner again as it comes from the bottom right corner of the
  display. A frame is made up of all of the lines the beam traced from
  the top of the display to the bottom.

  If the electron beam were on all of the time it was sweeping through
  the frame, all of the dots on the display would be illuminated. There
  would be no black border around the edges of the display. At the
  edges of the display the picture would become distorted because the
  beam is hard to control there. To reduce the distortion, the dots
  around the edges of the display are not illuminated by the beam even
  though the beam may be pointing at them. The viewable area of the
  display is reduced this way.

  Another important thing to understand is what becomes of the beam when
  no spot is being painted on the visible area. The time the beam would
  have been illuminating the side borders of the display is used for
  sweeping the beam back from the right edge to the left and moving the
  beam down to the next line. The time the beam would have been
  illuminating the top and bottom borders of the display is used for
  moving the beam from the bottom-right corner of the display to the
  top-left corner.

  The adapter card generates the signals which cause the display to turn
  on the electron beam at each dot to generate a picture. The card also
  controls when the display moves the beam from the right side to the
  left and down a line by generating a signal called the horizontal sync
  (for synchronization) pulse. One horizontal sync pulse occurs at the
  end of every line. The adapter also generates a vertical sync pulse
  which signals the display to move the beam to the top-left corner of
  the display. A vertical sync pulse is generated near the end of every

  The display requires that there be short time periods both before and
  after the horizontal and vertical sync pulses so that the position of
  the electron beam can stabilize. If the beam can't stabilize, the
  picture will not be steady.

  In a later section, we'll come back to these basics with definitions,
  formulas and examples to help you use them.

  3. Basic Things to Know about your Display and Adapter

  There are some fundamental things you need to know before hacking an
  Xconfig entry. These are:

     1. your monitor's horizontal and vertical sync frequency options

     2. your video adapter's driving clock frequency, or "dot clock"

     3. your monitor's bandwidth

  The monitor sync frequencies:

  The horizontal sync frequency are just the number of times per second
  the monitor can write a horizontal scan line; it is the single most
  important statistic about your monitor. The vertical sync frequency
  is the number of times per second the monitor can traverse its beam

  Sync frequencies are usually listed on the specifications page of your
  monitor manual. The vertical sync frequency number is typically
  calibrated in Hz (cycles per second), the horizontal one in KHz
  (kilocycles per second). The usual ranges are between 50 and 80Hz
  vertical, and between 31 and 135KHz horizontal.

  If you have a multisync monitor, these frequencies will be given as
  ranges. Some monitors, especially lower-end ones, have multiple fixed
  frequencies. These can be configured too, but your options will be
  severely limited by the built-in monitor characteristics. Choose the
  highest frequency pair for best resolution. And be careful --- trying
  to clock a fixed-frequency monitor at a higher speed than it's
  designed for can damage it.

  The card driving clock frequency:

  Your video adapter manual's spec page will usually give you the card's
  dot clock (that is, the total number of pixels per second it can write
  to the screen). If you don't have this information, the X server will
  get it for you. Even if your X locks up your monitor, it will emit a
  line of clock and other info to standard output. If you redirect this
  to a file, it should be saved even if you have to reboot to get your
  console back.

  If you're using SGCS X, the line will look something like the
  following example, collected from a Swan local-bus S3 adapter.
  XFree86 uses a slightly different multi-line format.

       WGA: 86C911 (mem: 1024k clocks: 25 28 40 3 50 77 36 45 0 0 79 31 94 65
75 71)
       --- ------ -----