TV Out on radeon 7500

[Alex Deucher]

On 10/21/07, nikosapi <nikosapi at gmail.com> wrote:
> On October 17, 2007 01:44:24 you wrote:
> > On 10/16/07, nikosapi <nikosapi at gmail.com> wrote:
> > > Hey Alex,
> > >
> > > Sorry for the late response, I've been busy :(
> > >
> > > I checked out the latest code from git (2007-10-16 @ 21:30) and tried it
> > > out, I now seem to be able to run the following xrandr commands and get
> > > an output on the TV:
> > >
> > > DISPLAY=:0.1
> > > xrandr --addmode S-video 800x600
> > > xrandr --output S-video --mode 800x600
> > > xrandr --output S-video --set tv_standard ntsc
> > > xrandr --output S-video --off
> > > xrandr --output S-video --mode 800x600
> > > # y default DVI-0 seems to be set to 1280x768, which makes the S-video
> > > output # the same resolution. I assume this is because the driver mirrors
> > > VGA-0 or # DVI-0 on the TV...
> > > xrandr --output DVI-0 --mode 800x600
> > > # btw, there is nothing but the TV plugged into the card
> > >
> > > The output of xrandr --verbose before the last command:
> > >         http://pastebin.ca/739340
> > > Here's my Xorg.0.log:
> > >         http://pastebin.ca/739346
> > >
> > > Finally I decided to try removing all of the ati card's configuration
> > > from my xorg.conf and create a new one just for the radeon card. Then I
> > > started a second X server like so:
> > >
> > > Xorg :1 -config /etc/X11/xorg.conf.radeon -novtswitch -sharevts
> > >
> > > Then I tried to get the TV output working. When I tried to do:
> > >         xrandr --output S-video --mode 800x600
> > > xrandr produced the following error:
> > >         xrandr: cannot find mode 800x600
> >
> > you need to add 800x600 to the server as the driver only adds it when
> > it detects a monitor or tv is attached.  Above it's actually adding an
> > existing 800x600 mode from another output to the S-video output.
> >
> > > * The reason I tried that is because eventually this is how I would like
> > > it to * work, I don't want to have two connected desktops, It would be
> > > better if I * could have two separate X servers with separate input
> > > devices, etc.
> > >
> > > I looked back at radeon_output.c but I'm really not sure how to enable
> > > load detection, sorry I'm not that good of a programmer ;)  If there's a
> > > specific way you would like me to test my card let me know, I wouldn't be
> > > surprised if I was doing something wrong.
> >
> > radeon_output.c ~lines 1776-1782.  basically set data = 1 there so
> > load detection will be enabled on all DAC based outputs. then assuming
> > load detection works properly, it will detect your TV and
> > automatically add and enable 800x600 on the S-video output.  You can
> > also try it on the fly with:
> > xrandr --output S-video --set load_detection 1
> > then try:
> > xrandr --output S-video --auto
> > and see if it works.
> >
> > Alex
>
> Hey Alex!
>
> I finally had more time to play with my video card and I had some success
> tonight thanks to your suggestions!
>
> I was able to get the TV out working by adding 'data = 1;' on line 1783 and
> now the TV output is detected and works perfectly. I tried using:
>          xrandr --output S-video --set load_detection 1
> but it didn't seem to work which is why I ending up making the modification to
> the source code that you described.
>
> So now, getting the TV output working is as easy as the following:
>
> Xorg :1 -config /etc/X11/xorg.conf.radeon -novtswitch -sharevts
> export DISPLAY=:1
> xrandr --output S-video --set tv_standard ntsc
> xrandr --output S-video --off
> xrandr --output S-video --mode 800x600
>
> I had one last question if you don't mind... I noticed that I can't use Xv on
> the TV out, only on the VGA output. Is this a limitation of the
> hardware/driver or is this just another misconfiguration?

Xv should work fine.  If you are using a clone mode, you need change
which crtc the overlay is sourced to using the XV_CRTC Xv attribute
(use something like xvattr to change it).  If you are using dualhead,
the overlay will appear on whichever head most of the video is on.

Alex