[mythtv-users] video distortion

[Will Constable]

I'm running two different resolutions, spanning desktops on vga and s-video.
This could be the problem I suppose - would unplugging the vga monitor do
the trick or do I have to boot with the output disabled?

 

Thanks!

 

 

  _____  

From: mythtv-users-bounces at mythtv.org
[mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Brian Wood
Sent: Wednesday, June 07, 2006 10:56 AM
To: Discussion about mythtv
Subject: Re: [mythtv-users] video distortion

 

 

On Jun 7, 2006, at 8:38 AM, Will Constable wrote:





I am running a frontend via s-video and when I use the same TV and s-video
cable from my laptop via windows I get a perfect picture, but using linux on
my myth box there is something wrong.  The color is fine but there are
vertically oriented bars of distortion that scan from left to right
constantly-they are transparent in the sense that you can see everything on
the screen just fine at any given time, but they are really annoying to look
at.  I am wondering if the video card itself, an old Geforce 4 MX420 I had
lying around, is just not a good enough card or might be damaged, or if
maybe a setting for the nvidia driver in my XOrg.conf could fix this.  Any
suggestions?

That card should work OK, at least it should produce distortion-free
pictures.

 

Is what you are seeing a "windshield wiper" type effect ? This can be caused
by another video signal that's slightly out of time to the one you are
wanting to watch, you often see it on a TV set that is overloaded by input
signal and the adjacent channel gets into the picture a bit, or it can be
caused by an overloaded cable or antenna amplifier ("cross-mod" or composite
triple beat products).

 

But to see it on a pure computer video would be odd, are you perhaps running
in twinview with a different signal on the DVI/VGA output ? 

 

Do you see the same problem on the straight DVI/VGA output of the card ?

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