[Nouveau] TV Out question

[Lukas Satin]

Yes, switching to 360x240 works! Interesting...it is definitely a step
forward while still not satisfying result.

On Fri, Nov 4, 2022 at 6:13 PM Lukas Satin <luke.satin at gmail.com> wrote:

> 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.
>>
>
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