[Openchrome-users] 720x576Noscale does scale 720x576Over doesn't scale

[Ivor Hewitt]

Paul Gardiner wrote:
> I've recently set up a MythTV frontend using Minimyth on a board with  
> a CN700 and a VT1622A. I'm using TV out via S-Video to a CRT TV with  
> Scart input. I initially set up mode 720x576Noscale, and was pleased  
> to find the TV image fitted to the TV screen exactly, but there were a  
> few strange things that started to make me think that the image was  
> being scaled:
>
> 1) The OSD images had to be adjusted to about 650x550, for it to also fit the
> TV screen.
>
> 2) The TV image showed various artifacts that could be exaplain by  
> scaling (jagged diagonal edges, rippling during pans, a general  
> softness of focus).
>
> When I first looked at the X screen via VNC I found TV was being  
> scaled. The X screen was 720x576, but the decoded TV image was being  
> mapped onto a 650x550 subarea, and this area was somehow mapping  
> exactly onto the TV screen.
>
> I've just swapped to using the mode 720x576Over. I get a much better  
> quality image, and now the TV image extends off the edge of my TV  
> screen by the same amount as the OSD. If I look via VNC, I can see the  
> TV image mapping directly to the full 720x576 area of the X screen.
>
> Anyone know what's going on here? Also, anyone know how I should  
> adjust the mode to fit correctly to the TV. I have no real experience  
> of adjusting X. Is there a tool that allows on-the-fly adjustment of  
> mode variables?
>   
please post a gzipped xorg log of the noscale mode. It should work.