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 <imir...@alum.mit.edu> wrote: > On Fri, Nov 4, 2022 at 12:56 PM Lukas Satin <luke.sa...@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@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. >