Re: Monitor Squeal
From: Dances With Crows (danSPANceswitTRAPhcrows_at_gmail.com)
Date: 01/03/05
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Date: 2 Jan 2005 23:37:25 GMT
On Sun, 02 Jan 2005 22:27:23 GMT, Murphy staggered into the Black Sun
and said:
> Floyd L. Davidson wrote:
>> Murphy <m@urphy.com> wrote:
[ a monitor that makes a squealing noise under Linux ]
>>>Maybe so but it has worked perfectly until now with Windows and still
>>>works perfectly when I run Windows, the only problems are encountered
>>>when I run Linux.
>> WRONG. It has *nothing* to do with which OS you run. The solution
>> has been give to you several times now... don't configure your
>> system to us 60 Hz vertical refresh.
> Floyd, I agree it has nothing to do with the OS but the fact remains
> that under Linux the problem exists and under Windows it doesn't
The problem is almost certainly with X's config file. Put your
/etc/X11/xorg.conf or /etc/X11/XF86Config file on your webspace and
follow up with a URL that points to that file, so the people who know
about X can look at the whole thing and give advice.
> I would love to configure the system not to use the 60Hz vert refresh
> rate however being a total newbie it takes time to figure it out and
> from experience best not to screw with things unless you A) know what
> you're doing and B) have researched sufficiently to be confident that
> the change is the correct one.
A) and B) are a good start, but it's better IME to have C) make a backup
of the system/file you're going to change, and make sure you know how to
restore it. That way you can change all sorts of stuff without knowing
everything. Just make sure you don't screw up /lib/libc* , /lib/ld.so* ,
/sbin/init , or /etc/inittab --it's a bit of a pain to recover when
your libc is gone, and it's a pain to boot when init is missing or
incorrectly configured.
> I have also located the xorg.conf file and am reading through it. What
> puzzels me is why in KDE only a refresh rate of 60Hz is listed in the
> drop down box that obviously is made to list various options, if I had
> the correct drivers installed surely I would have the correct options
> listed in this drop down list ? (as I have in Windows)
There are a number of reasons why this could be happening. Without
looking at the xorg.conf , I can't tell you which one's correct. Either
you're using the VESA X server (don't use that; it's slow and lacking in
useful features, although some distros use it for Cthulhu-only-knows
what reasons) or the Hsync and Vsync ranges you entered for your monitor
are too narrow.
> Does KDE display the values in the "Screen Resize and Rotate" refresh
> rate list box dependant upon the drivers installed or is it simply
> read from the xorg.conf file?
Both. If you're using VESA, you're stuck at 60Hz. If you're using a
video-card-specific X server, you're limited by the Hsync and Vsync
ranges you've entered (or the ranges X reads from your monitor via
DDC/EDID.) My desktop has a NEC Multisync 95 attached to an nVidia
TNT2, and when I use the evil binary-only nvidia X server, I get 75Hz at
1280x1024. (works for me!)
> and if the latter then surely this is anything but plug n play
> hardware detection.
X configuration is (still) a bit of a mess. It used to be a lot worse.
Part of the problem is that some monitors report incorrect info via
EDID/DDC. Part of the problem is that some distros set things up so
that VESA is used instead of the proper video-card-specific X server.
Part of the problem is that the Xorg people are dealing with a huge mess
of bugs/feature requests right now, and autoconfiguration of X isn't a
huge priority (though X 4.n has always been able to do "X -config",
which typically writes a usable X config file unless X doesn't support
the graphics card you have at all.)
-- Matt G|There is no Darkness in Eternity/But only Light too dim for us to see Brainbench MVP for Linux Admin / mail: TRAP + SPAN don't belong http://www.brainbench.com / Hire me! -----------------------------/ http://crow202.dyndns.org/~mhgraham/resume
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