[Openchrome-users] KM400 and S-Video somebody?

[Xavier Bachelot]

quetzal wrote:
> KM400 and S-Video somebody?
> Hi everybody,
> 
> When I try startx enabling the S-Video output I get the following line:
> 
> (--) VIA(0): Detected Chrontel CH7019B LVDS Transmitter/TV Encoder
> 
> Then I get lots of "Not a mode defined by the TV Encoder" lines while probing different video modes.
> 
> The final result is a bad image on my TV where only half of screen is filled and the image is overlaped on the top and right  sides. 
> 
> My actual Device section on xorg.conf is as following:
> 
>         Identifier "Card0"
>         Driver     "openchrome"
>         Option     "ActiveDevice" "TV" 
>         Option     "TVType" "PAL"
>         Option     "TVOutput" "S-Video"
>         VideoRam 65536
>
VideoRam option is unneeded, unless the ram size is badly auto-detected.


> The Monitor section is:
> 
>         Identifier   "Monitor0"
>         HorizSync    30 - 50
>         VertRefresh  50.0 - 50.0
>         DisplaySize  300        225
>

Not sure DisplaySize is really useful.

What is missing here is the screen section. It needs to use one of the 
listed resolution for CH7019 PAL at the bottom of the TVOut page in the 
wiki, that is 640x480, 640x480Over, 800x600, 800x600Over, 1024x768 or 
1024x768Over.

http://wiki.openchrome.org/tikiwiki/tiki-index.php?page=TVOut

> Has anybody managed to output good tv-out image quality on KM400? Could somebody post it's working xorg.conf?
>
The chipset is irrelevant here, only the TV encoder is.

> On the TV-Out only talks about CH7019 video encoder, nothing about CH7019B... :(
>
I'd assume it is mostly the same, but I don't really know actually.
There has not been a lot of people reporting using a CH7019 tv encoder, 
so it's possible the support is not that good. iirc, I stumbled across 
some chrontel tv encoder spec files on the net, so possibly someone can 
help improving the support, even w/o the actual hardware.

Regards,
Xavier