S-Video out with radeon with 'Flyback Lines' showing on the TV

Alex Deucher alexdeucher at gmail.com
Sun May 16 21:18:54 PDT 2010

On Sun, May 16, 2010 at 3:02 PM,  <uebershark at googlemail.com> wrote:
> Hi!
> I'm experiencing a weird issue using TV-out (S-video) with the
> xf86-video-ati driver.
> TV-out works, but I get weird 'flyback lines' on my TV screen.
> Same setup running WindowsXP does not have these showing, so I can
> rule out a connection problem.
> The TV is rather old, connected via S-Video cable+SCART adapter.
> I've posted about this here:
> http://www.linuxquestions.org/questions/showthread.php?p=3963780#post3963780
> The second posting has a photo-attached, which shows what I mean.
> There's also xrandr output there.
> So far, I've tried to adjust the output via Modelines, I got the ones
> WindowsXP uses via PowerStrip as mentioned somewhere in the
> freedesktop wiki, but that didn't help.
> Any ideas what I could try?

Make sure you are using the right video standard and a recent ddx for
ums or kernel for kms.  Modelines are irrelevant for tv-out since the
driver uses a hard coded modeline regardless of what the user


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