[Nouveau] TV Out question

[Lukas Satin]

1) Some people here say: " Scrap everything already stated. The old Nvidia
cards with the mini DIN analog video out can ONLY do 480i output. 240p is
not an option."

Source:
https://www.reddit.com/r/crtgaming/comments/a9k85n/old_nvidia_geforce_output_240p/

But I guess that is due to using Windows and NVIDIA driver.

2) Here:
https://www.reddit.com/r/retrogaming/comments/40dv00/240p_signal_from_svideo_port_on_old_video_card/
someone says: "240p doesn't actually exist, it's really a trick that uses a
non-standard 480i signal to cause the alternating fields line up the
scanlines instead of offsetting them. "

So I guess it could be done by sending non-standard 480i signal.

On Fri, Nov 4, 2022 at 6:06 PM Ilia Mirkin <imirkin at alum.mit.edu> wrote:

> On Fri, Nov 4, 2022 at 12:56 PM Lukas Satin <luke.satin at gmail.com> wrote:
> >
> > Hello, sorry fo the typos. Wanted to catch you before the weekend, to
> get some hints for upcoming work.
> >
> > I'm back at PC.
> >
> > Does your driver support switching to 240p in NTSC and 288p in PAL on
> the go via xrandr, for example?
> >
> > If not, can I find some relevant part of code in your repository where
> to implement that?
>
>
> https://cgit.freedesktop.org/drm/drm/tree/drivers/gpu/drm/nouveau/dispnv04/tvnv17.c
> + tvmodesnv17.c
>
> There's definitely a lot of hard-coding going on. A lot of the
> pre-nv50 display code is from This code is (likely) originally from
> https://cgit.freedesktop.org/xorg/driver/xf86-video-nv/tree/src but I
> can't immediately find the TV code in there. But perhaps it's there
> anyways, I only spent about 30s looking for it.
>
> I don't remember by now, but there _might_ be a kms property (which
> should get piped through to xrandr properties) which allows you to
> change this live?
>
> > Some info I found regarding 240p and that it is a part of NTSC:
> https://en.wikipedia.org/wiki/Low-definition_television
> >
> > TV with S-Video mostly supports 480i and 240p as well. So the current
> issue is outputting that via TV out.
> >
> > My current configuration looks like this:
> > TV-1 connected 240x224+0+0 (normal left inverted right x axis y axis)
> 0mm x 0mm
> >    720x480       59.94 +
> >    1024x768      59.94
> >    800x600       59.94
> >    720x576       59.94
> >    640x480       59.94
> >    400x300       59.94
> >    320x240       59.93
> >    320x200       59.94
> >    768x576       50.00
> >    360x200       60.00
> >    360x240       60.00
> >    640x240       60.00
> >    SR-1_240x224 at 60.10  60.10*
> >
> > I see I have created 240x224 (I need to fix that), but even 320x240 does
> not work. It always stays at 480i.
>
> Did you try 360x240? I have no idea though, sorry. I was just happy
> when the S-Video worked at all. It could require further modifications
> to how we configure those registers.
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/nouveau/attachments/20221104/595e3806/attachment-0001.htm>