Re: Blurry video on a HP nc4200
- From: "The Electric Fan Club" <ian.shorrocks@xxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 2 Dec 2005 08:35:56 -0000
"Matthias Bethke" <bethke@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:3v8udpF1511k4U1@xxxxxxxxxxxxxxxxx
> My boss has an HP nc4200 notebook he wants to use for presentations.
> Unfortunately, we found the video output is quite unstable, i.e. there
> is something like an interference wave running down the picture, every
> display line seems to jiggle left and right by about 2-3 pixels. Another
> nc4200 shows the same pattern, so it's probably a software problem. Both
> machines are running Gentoo Linux with X.org 4.8.99.15. We haven't tried
> either under Windows yet as it would mean a complete reinstallation. Any
> experiences with this misbehavior? Maybe something to do with the two
> different rendering pipes in the gfx adaptor? I never quite got what
> they are meant for anyway, Pipe A seems to be unused here and the CRT
> uses the same one as the internal display.
>
It is most likely that the refresh rate of the output from the laptop does
not match the optimum for the projector (it should probably be 60Hz - but
check the book of instructions).
It is also just possible that you have an earth loop, if both the projector
and the laptop are earthed. Does the problem disappear if you run the
laptop on the battery?
.
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