[mythtv-users] MythTV output to HDMI IN

[Douglas Wagner]

This sounds very much like my sharp.  On my sharp LC-37D40U I have a similar
number of inputs, however they are grouped.  I have actually 5 complete
input sources with about 9 different input types.  Input 5 is an HDMI only
input, Input 4 is an HDMI input but it also has the white/red audio in (the
standard RCA in), Input 3 is for some video types and has svidio and
component video in...etc.  What this means is that you have an ability to
hook up many types of devices to your TV based upon the different input
types, and for each "input" to the TV you have various options that you can
select from (svidio, component, composit, hdmi, etc.)  Again, on my TV
there's a button that pulls down a dropdown, in the dropdown I have 5 input
sources to match the 5 inputs on my TV.  If you select TV at the top it
displays standard TV, if I select 5 (the HDMI only) it switches to my
HighDef DVD Player, if I select 4 it switches over to my MythTV box (using
DVI -> HDMI and Mini->RCA audio), etc.

I'm guessing your system will work the same.  As far as I can tell, if the
TV is powered off you STILL get your EDID information.

Now as to modelines: EDID is retrieved every time you boot X, so if you
setup X with a standard monitor, boot the system with X running, unplug the
monitor and plug in your TV, it's 99.999% sure to give you an "out of range"
message on your TV.  If however you then stop X and re-boot it, it's
99.999%likely to come up in SOME resolution that your TV understands
(VERY likely
720x480 or a 480p mode).  If your TV is like mine (and i'm guessing it
probably is) you will have several resolutions that are supported: 720x480
(that's the generic 480p TV resolution), 1280x720 (That's the generic 720p
High Def resolution), and you'll probably see an EDID line for 1920x1080
with the interlace flag attached to it (that's the generic 1080i high def
resolution), it's likely however when you look FARTER down the list and see
the valid resolutions that Xwindows desides you have you will NOT find the
1080i resolution as a viable one...there is some setting (I forget which,
i've been dealing with 720p resolution for the last month and a half i've
had the box up) that will tell the NVidia driver that it's "ok" to use the
interlaced resolution (it's an EDID flag that I forget off the top of my
head...something like Ignore EDID Vsync or something like that).

Now, I agree that you SHOULD be able to turn off EDID and the modelines that
you have in there should work, however i've had issues on my Sharp where
even with the EDID modelines specified by EDID as valid modelines, the TV
decides it doesn't like them.  So turning off EDID might not be your
solution, on the other hand it might.

--Doug


On 5/12/06, Steven Adeff <adeffs.mythtv at gmail.com> wrote:
>
> On 5/12/06, moogie <okcancel at yahoo.com> wrote:
> > A couple of follow-up questions while I wait for
> > my nVidia 5200 FX to arrive.
> >
> > From your responses above, the suspect the answers
> > to the following will be "yes" but I want to confirm.
> >
> > 1.  The Sony LCD RP has 9 input sources.  When
> > I connect the DVI to the HDMI input, does the
> > physical LCD screen have to be tuned on the HDMI
> > input source?  Or can the LCD be tuned to any
> > other source (like DVD)?  That is, will Sony
> > respond and Xorg be able to capture modeline data?
>
> It shouldn't matter what channel the TV is on, but it will need to be
> powered on =D
>
>
> > 2.  Can Xorg on my Myth box still get the modeline
> > data from the Sony if the LCD is turned off but
> > the Sony unit has power?
>
> That I dunno, but once you have the modeline data you don't need to
> get the EDID data anymore, just tell the computer to ignore EDID and
> use the modelines you specify.
>
>
> > FYI, when I hit the OFF button on the Sony remote,
> > it turns off the LCD screen and a few moments later
> > the fan goes off.  The little indicator light on
> > the LCD front panel at the bottom right is green
> > when the LCD is on and red when the LCD is off.
>
> right, some of the electronics stay on, but most is powered off. But
> like I said, get the data once and don't worry about it from then on
> out.
>
> --
> Steve
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> http://www.mythtv.org/wiki/index.php/Frequently_Asked_Questions
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