old-www/HOWTO/XFree86-Video-Timings-HOWTO/obsolete.html

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>2. Why This HOWTO Is Obsolete</H1
><P
>In X.org (and for 4.0.0 and later versions of the now-obsolete
XFree86) you no longer have to generate modelines at all under most
circumstances. Instead they are computed internally by the server at
startup time, based on the resolution you specify in the the monitor
capabilities your X server gets via an EDID query to the monitor (and
the Modes part of the Screen section part of your X configuration
file, if you have one). </P
><P
>To change your screen resolution and color depth, simply edit or
create a Display section describing it. Here is a sample Screen
description from the X configuration file of my laptop:</P
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>&#13;Section "Screen"
Identifier "Screen0"
Device "ATI Rage Mobility"
Monitor "Monitor0"
DefaultDepth 16
Subsection "Display"
Depth 16
Modes "1024x768"
EndSubsection
EndSection
</PRE
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>All you will usually need to do is change the numbers in the
Modes entry. X will do the rest. If you specify an impossible
resolution, it will fall back to the closest approximation that the EDID
data from the monitor says it can support.</P
><P
>Therefore, the information in the remainder of this HOWTO is
useful only if (a) you have an old, pre-EDID monitor, or (b) your
graphics-card driver doesn't support querying the monitor, or (c) you
are running a very old version of X (in which case, you should
fix your problem by upgrading), or (d) your monitor/card combination
operates outside the range over which X has canned modelines.</P
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