Arch Linux

kannalo

Member

Registered: 2021-04-07

Posts: 9

Radeon 3650 Svideo Output

I'm having trouble getting svideo output working on my second gpu. I have a 6700xt installed and picked up a radeon 3650 for the s-video port so I can connect to my crt tv

The steps on the wiki here do not work particularly the part about the 800x600, after adding the mode with "xrandr --addmode DIN-1 800x600" and trying "xrandr --output DIN-1-1 --mode 800x600" xrandr prints "xrandr: cannot find mode 800x600"
https://wiki.archlinux.org/title/ATI#TV_out

I managed to get some video output by doing these commands the modeline was made with cvt

xrandr --output DIN-1-1 --set "load detection" 1
xrandr --output DIN-1-1 --set "tv standard" ntsc
xrandr --newmode "640x480_60.00"   23.75  640 664 720 800  480 483 487 500 -hsync +vsync
xrandr --addmode DIN-1-1 "640x480_60.00"
xrandr --output DIN-1-1 --mode "640x480_60.00"

This mirrors the top corner of one of my other displays to my crt instead of making it act as a third screen. Does anyone know how to get it to act as a third screen? I tried doing --right-of DP-1 but that resulted in weird behavior I could drag windows there for a few seconds before they pop back to my other display. I dont think gnome was detecting it as a connected screen as it didn't seen to extend the de to it.

Preferably id also like a way to make it act like a third screen and show up in gnome display settings for use in wayland because having to switch to gnome xorg jsut for this screen would be annoying

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 25,255

Re: Radeon 3650 Svideo Output

It's not exactly trivial to make distinct and unrelated graphics cards work together "seamlessly". You'd be much better off with a hdmi to svideo adapter you can plug into your 6700xt to be frank.

On xorg you can "fairly trivially" run a completely distinct screen but that gives you some stipulations like having to explicitly export DISPLAY for programs you want on one or the other screen and not being able to change that on the fly.

kannalo

Member

Registered: 2021-04-07

Posts: 9

Re: Radeon 3650 Svideo Output

I had no issues with a previous old card and vga output i think the problem is getting the svideo working properly, theres not much info on it online either