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<TITLE>The Answer Guy 32:
Tuning X to work with your Monitor
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Monitor config problem
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<H4>"Linux Gazette...<I>making Linux just a little more fun!</I>"
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<H4 align="center">By James T. Dennis,
<a href="mailto:answerguy@ssc.com">answerguy@ssc.com</a>
<BR>Starshine Technical Services, <A HREF="http://www.starshine.org/">http://www.starshine.org/</A>
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<H3><img src="../gx/dennis/qbub.gif" alt="(?)"
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>Tuning X to work with your Monitor</H3>
<p><strong>From Alan Morton on the L.U.S.T Mailing List
on 14 Aug 1998 </strong></p>
<!-- begin body -->
<p><strong>I am wondering if anyone on the list has any experience with a vid
card/monitor combination similar to mine, or have any experience
with this particular problem that can either give me some
constructive advice or can point me to some relevent documentation.
</strong></p>
<p><strong>I am using a Jaton 67-P video card with 4 megs of RAM. I am trying
to use it with a HP 4033A monitor. The problem is that whem I use
Xconfigurator (I'm using a RH5.0 distro) irregardless of what it
says about an acceptable configuration, when I start up X it trips
the Power Saving function on the monitor and it goes blank.
</strong></p>
<p><strong>When I use the cntrl-alt-backspace it naturally kills X, plus it
retrips the monitor and my screen begins to reappear. I am making
the assumption that it is engaging some error procedure in the
monitor, which is fine. But I really want to get this working at a
reasonable resolution. If I use a setting of 800x600 and 8 bit
color it works just fine, but that seems a bit wasted on a 21"
monitor.
</strong></p>
<p><strong>I know the monitor will handle a lot because I can use it at
1024x748 in 16 bit color with my Windows NT boot-up. And I have a
friend with an identical monitor running 1280x1024 in 24 bit color
under Win95.
</strong></p>
<p><strong>I don't think the problem is the card because I have been running
it with a 14" Magitronic monitor previously at 800x600 in 24 bit
under both NT and Linux with no problems.
</strong></p>
<p><strong>Any assistance with this will be greatly appreciated.
<br>Alan Morton
</strong></p>
<blockquote><img src="../gx/dennis/bbub.gif" height="28" width="50"
alt="(!)" border="0"
>The problem you are having is related to the refresh rate that X is
trying to use for the mode you are trying to display. The rate may
be either too high or too low. I am not sure exactly about the
specifics of what needs to be done to change the refresh rate that X
uses, but I'm sure there is a good source of information for
configuring the display properties of X. Hopefully this will narrow
your scope in searching for an answer, because I don't really know
what else would cause this problem. Any other suggestion welcome.
</blockquote>
<blockquote>Configuring X on a system is like a classic "three-body problem."
</blockquote>
<blockquote>You have to get the correct software and libraries all
installed (which any distribution makes pretty easy).
</blockquote>
<blockquote>You have to select the correct "server" for your video card.
This is complicated by the number of video card manufacturers
--- many of whom have many models of video card, often
identified by a stream of very similar sound digits and
letters while using completely different combinations
of chipsets, clock chips, and RAMDAC's (digital to analog
coverters?).
</blockquote>
<blockquote>You have to provide a "tuned" set of video timings. This
is primarily dependent on your monitor.
</blockquote>
<blockquote>Getting all of these things to work together is still a
pain. However, the xf86config, SuperProbe, and Xconfigurator
have helped alot. I've heard that Eric S. Raymond's
Video-Timings-HOWTO has helped alot of people (though I've never
used it myself). I've played with '<tt>vidtune</tt>' (an X program that
allows you to tune your video times after you've gotten
"close enough") --- but it's still a bit mysterious to me.
(How to I get it to write the timings out to a format I can
use in my XF86Config?)
</blockquote>
<blockquote>I usually just use a "hit and miss" approach by looking
through the list of samples in <tt>/usr/X11R6/lib/X11/doc/Monitors</tt>
(or thereabouts). The one on my
<A HREF="http://www.suse.com/">S.u.S.E.</A> box lists about
65 different samples for various monitors. I just play with
them a bit while I hand hack on the <tt>/etc/X11/XF86Config</tt> file
(which is probably the least efficient way of doing it ---
but usually <tt>Xconfigurator</tt> and a good multisync monitor
get along O.K. so I usually don't have to fuss too much).
</blockquote>
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<H5 align="center"><a href="http://www.linuxgazette.com/ssc.copying.html"
>Copyright ©</a> 1998, James T. Dennis <BR>
Published in <I>Linux Gazette</I> Issue 32 September 1998</H5>
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