Re: [XFree86] LCD proplem. Something that might be fixed in X

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On Tue, Nov 11, 2003 at 06:16:56PM +0000, ??r?ur ?var Bj?rnsson wrote:
> Hello.
> 
> I have attached my XF86Config and here is the output of ' uname -a'
> [thib@claufield ~]$ uname -a
> FreeBSD claufield.bitcode.org 5.1-RELEASE-p10 FreeBSD 5.1-RELEASE-p10 #0: Mon Nov 10 19:48:31 GMT 2003     root@xxxxxxxxxxxxxxxxxxxxx:/usr/obj/usr/src/sys/claufield  i386
> 
> Now the proplem is that my LCD monitor displayes  these vertical "blurry" lines.
> This is a 17" LCD monitor and on diffrent places on the screen there are blurry vertical lines about 2cm thick. ( 2 sometimes 3 "lines" )
> These lines are not always in the same place ( they "move" around when I press "AutoConfigure" on my LCD and when I select it
> on the OSD" ) It was pointed out to me that LCD monitors had a sweet spot for Vertical refresh rate 60Hz but that did nothing for me,
> I have tryied this "phase" option on my monitors OSD but it only "moves" the blurry lines horizontaly over the screen and I cant seem to get rid of them. I have tryied various resulutions and Vsync and Hsync values but nothing seems to fix this and perhaps this is not something I can fix within
> X since this is also on my console. ( but the screen works perfectly on Windows XP/9x )
> Any tips or pointers are so welcome.


This is due to the horizontal scan area being slightly smaller or
larger than your monitor is expecting; you're seeing a Moire
interference pattern between the input and the screen's native [fixed]
pixels.

Make sure you're driving the monitor at the correct resolution, and
that the monitor has gone through its analog 'auto adjustment' routine
where it senses the horizontal scan width.  Many analog LCD screens
also have fine adjustment for horizontal scan width and sampling
offset.

Of course, using DVI should Simply Eliminate The Problem.

Monty
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