[mythtv-users] Running TV out OR DVI out, not both

Bill Williamson bill at bbqninja.com
Sun Dec 7 07:36:47 UTC 2008

On Sun, Dec 7, 2008 at 4:56 PM, Allen Edwards <allen.p.edwards at gmail.com> wrote:
> On Sat, Dec 6, 2008 at 8:26 PM, Bill Williamson <bill at bbqninja.com> wrote:
> > This is a bit more of a basic Linux question, so please forgive, but has
> > specifics that are valid here.  For reference, I am running ubuntu 8.10 and
> > myth .21 from mythbuntu packages.
> >
> > Basically what I want is a dual headed machine where only 1 head is active
> > at a time.  I got a nice new geforce 8400 for future use with VDAPU, and it
> > has tv out (going to a smaller PAL tv via component) and dvi out (going to a
> > 720p projector via hdmi converter).  I want to be able to run via TV, OR run
> > via projector.  I do not care (nor want) dual outputs.
> >
> > In the olden days (slackware 1998-ish), before gdm and the like, I'd just
> > run "startx" from my first two terminals, and use ctrl-alt-f7 and
> > ctrl-alt-f8 for the two x sessions.  I don't want to do something that
> > manual, but is there perhaps an easy way to tell GDM to spawn twice, with a
> > different xorg config?  Or is there a way to force the nvidia
> >
> > I don't mind having to do a key combination (and run blind for 10 seconds if
> > it starts in the wrong one), but don't want to be dropping to console/etc
> > every login.  I don't mind if technically it's running two x-servers as long
> > as mythtv works, and with the correct settings for each (I guess I'd set up
> > two different settings names in two different shortcuts?)
> >
> > My "ideal" setup would be similar how laptops work in windows.  You hit some
> > key combinations to activate TV-Out, then another combo to disable it.
> >
> > _______________________________________________
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> > mythtv-users at mythtv.org
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> >
> >
> You have the same setup I have.  Normally I watch myth with S-video
> out playing to a CRT TV.  When we want to use the projector, we use
> DVI output to a HDMI projector.  I have tried several arrangements but
> what I do it to have the projector switched away from the myth box (by
> selecting DVD on my DVI switching preamp) and start X so that it
> starts up on the TV.  I then do a CTRL-ALT-BS and myth shows up on the
> TV.  Turn the projector on and switch to it, CTRL-ALT-BS and in a few
> seconds myth is on the projector.  The Xorg.conf setup is key to
> making the setup work.  The outputs are assigned single resolutions,
> not auto.  I have two displays defined in xorg.  Basically if myth
> sees the projector, it starts up there, if not it starts up on the TV.
> There are other ways of doing this.  You can start myth on either
> display if both display/desktops are there but be sure to close myth
> down if you leave a display.  You can switch desktops with the mouse
> but the problem is that the remote will operate both instances of myth
> if you happen to have one on each desktop/display.  With two instances
> running, they will get out of sync and you have no idea what the one
> you are not watching is doing.  Since you cannot see a screen that is
> turned off, this can be a problem which led to my solution being
> easier even though it seems crude.
> If I didn't have a preamp that switched the DVI for me, I would
> probably just unplug the hdmi cable into the projector so that myth
> would not see it when X starts up.
> Hope this helps,
> Allen

Can you post your xorg (or mail it to me privately?) That REALLY may
work for me, as I can boot with the projector off most of the time,
and with it on (and restart X) when I want.

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