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List:       redhat-list
Subject:    RE: X - what causes shadow images?
From:       "Furnish, Trever G" <TGFurnish () herff-jones ! com>
Date:       2003-02-22 19:58:14
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> -----Original Message-----
> From: nate [mailto:redhat@aphroland.org]
> Sent: Saturday, February 22, 2003 1:22 PM
> To: redhat-list@redhat.com
> Subject: Re: X - what causes shadow images?
> 
> 
> Furnish, Trever G said:
> > Help?  I've worked my way through so much X documentation I 
> dreamt about
> > it last night (not a good dream either).
> >
> > What might cause a series of "shadow images" on a monitor 
> that works fine
> > with Windows but is barely readable with X?
> 
> my guess would be a buggy driver. What video chipset are you using?
> 
> perhaps a commercial X server would suit your system better, 
> MetroX and
> AcceleratedX are both good quality and tend to support some 
> of the more
> obscure cards better then xfree.
> 
> though they are not free. not too expensive though.
> 
> nate

Thanks for the input.  I've used MetroX in the past, but I'm hoping to stick
with XF86 and just learn how to fix this one - I don't actually use X
directly on this system very often.  The thing is I don't really think it's
a driver issue - I've had similar issues many times in the past with many
chipsets and many different monitors, just never taken the time to figure
out the cause.

Current chipset is an ATI Rage128 which X identifies as ATI Mach64.  The
problem doesn't *feel* like a driver problem - it just seems like it must be
something wrong in the definition of the monitor in the config file, like
maybe the sync rates are just slightly off.  I wish I could take a
screenshot, but of course the screenshot would look normal on someone else's
computer.

Question: how do I force X to use the sync rates I want it to?  I've
manually listed only one hsync and vsync instead of using a range, but X
still adjusts them a little.  Here are the bits from my xf86config-4:

        HorizSync 106.3
        VertRefresh 85
        Modeline "1600x1200"   229.50   1600 1680 1872 2140
                               1200 1213 1216 1254 +hsync +vsync

Xvidtune shows thta the modeline settings were applied, but it shows a
horizontal sync rate of 107.24 and a vertical sync rate of 85.52 - off just
a little from what I specified (which were the numbers straight out of
themanual).

--
trever



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