[mythtv-users] xScanDisplacement

[Jeremy White]

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