[mythtv-users] xScanDisplacement

[Joe Votour]

Jeremy,

One thing that I noticed with fbset -x is that even
though your display is okay, XFree86 will override any
modelines that it thinks might blow up your
monitor/TV.

Try checking /var/log/XFree86.0.log, this should give
you some idea why your mode was rejected.  You'll then
need to adjust it (either vertically or horizontally)
until it fits.

If it's the vertical, you might be able to get rid of
the "VertRefresh 60" line, since you're close enough
to 60 that you probably won't blow up your TV.  :)

-- Joe

--- Jeremy White <jwhite at codeweavers.com> wrote:
> Replying to my own post, in case anyone searches the
> archives for this:
> 
> I found joy by switching the Matrox G400 to 800x600
> mode;
> I don't know why, but this works, and seems to
> eliminate the
> black border on the right almost completely.
> 
> Here is the output of the fbset -i I am using, which
> seems to work nicely
> for me.  I derived these values by no intelligence
> or rocket science
> on my part, so please take them with a large grain
> of salt:
> 
> mode "800x600-61"
>      # D: 37.154 MHz, H: 43.002 kHz, V: 60.996 Hz
>      geometry 800 600 800 600 16
>      timings 26915 34 0 75 30 30 0
>      hsync high
>      rgba 5/11,6/5,5/0,0/0
> endmode
> 
> I did adjust the pixclock such that the V freq was
> near 60; I
> thought that might be necessary to make a fbset -x
> suitable for
> insertion in my XFConfig file (so I wouldn't have to
> call fbset
> directly).  I got nowhere with that, and persuaded
> myself that
> I really don't understand what's going on.  I
> suspect that the
> Matrox TV-Out circuitry is doing enough magic that
> the rational
> monitor howtos don't seem to apply...
> 
> Cheers,
> 
> Jeremy
> 
> Jeremy White wrote:
> > Hi all,
> > 
> > I seem to have the same problem discussed in this
> thread:
> >  
>
http://www.gossamer-threads.com/perl/mailarc/gforum.cgi?post=70854
> > 
> > That is, while I have used fbset to make the Myth
> interface nicely
> > fill the screen, when I watch live TV or do any
> playback, I have a strip
> > on the right, perhaps 15% of my horizontal
> display, that is black.
> > 
> > And neither the Overscan or Scan Displacement
> settings seem to affect
> > this in the appropriate way.  Adjusting the
> overscan seems to only
> > affect the scaling within the existing window.
> > 
> > I'm using a G400, with the MGA driver in fb mode;
> this is 0.11 on a Debian
> > box, with a cheap bttv tuner.  (And everything
> else works brilliantly, 
> > afaict,
> > insert redudant heaps of praise here <g>).
> > 
> > I'm hoping that there is something stupid that
> I've overlooked that
> > will clean this up.  I'd be happy to try to kick
> in some Real Work,
> > if that would help.
> > 
> > I'm dreading the pronouncement that the mga xv
> driver is as foobared as 
> > the Via one...
> > 
> > Thanks,
> > 
> > Jeremy
> 
> > _______________________________________________
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> mythtv-users at mythtv.org
>
http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> 


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