[mythtv-users] HDMI & the elimination of customised modelines for 480i, 480p, 720p, 1080i and 1080p

Jonathan Seawright jonathanathome at verizon.net
Tue Jun 5 23:39:17 UTC 2007

I'm not sure if this has anything to do with what you're talking about, but 
here goes anyway.

I'm using a DVI>>> HDMI cable going into the regular HDMI port on my HDTV 
(There is another HDMI port that is intended for "computer" resolutions, IE: 

It displays quite nicely, however, the outer edges of the screen aren't 
shown (probablt 50-25px worth).. could this be the vertical/horizontal 
refresh rates?

This is what I'm currently using as my xorg.conf: 

By the way, changing between the different settings (like 480p and 1080i), 
doesn't seem to have any effect on the appearance... I looked under gnome's 
"screen resolution" app, and it stays at 1280x720 ... o_0 It seems as if 
linux is ignoring my xorg.conf file!

Any suggestions would be greatly appreciated... and I'm sure it would help 
out alot of other people as well...


Jonathan S

----- Original Message ----- 
From: "Steven Adeff" <adeffs.mythtv at gmail.com>
To: "Discussion about mythtv" <mythtv-users at mythtv.org>
Sent: Monday, June 04, 2007 10:44 PM
Subject: Re: [mythtv-users] HDMI & the elimination of customised modelines 
for 480i, 480p, 720p, 1080i and 1080p

On 6/4/07, James Buckley <xanium4332 at googlemail.com> wrote:
> On 04/06/07, Steven Adeff <adeffs.mythtv at gmail.com> wrote:
> > On 6/4/07, Mark Kendall <mark.kendall at gmail.com> wrote:
> > > On 6/4/07, James Buckley <xanium4332 at googlemail.com> wrote:
> > > > I'll take the lack of response to this question that the info is
> probably
> > > > wrong/inaccurate?
> > >
> > > I think it's probably because it wasn't entirely clear what you were
> asking :)
> >
> > yups.
> Hmm, okay forget that question then...
> > > > Alternatively, I'm wondering whether HDMI capable STBs and DVD 
> > > > players
> also
> > > > calculate the (equivalent) modeline based on the TV's EDID info, or
> just use
> > > > some inbuilt timing information for the common formats (720p, 1080i,
> 1080p).
> > > > Anyone know anything about this, or have some standard HD modelines
> that
> > > > should work on most HDMI inputs.
> >
> >
> > most set top boxes are dumb in this regard, they don't use the EDID at
> > all requiring the user to properly set them up. EDID is basically
> > useless for most TV's as the values are wrong. Some are correct
> > though, and some companies have even fixed the wrong EDID information
> > in firmware updates.
> >
> > Your best bet is to use one of the modeline database standard
> > modelines, or the NVidia modepool (both explain in the mythtv wiki).
> > As these use the standard ATSC settings and should work on all TV's.
> > You may need to disable usage of some parts of the EDID detection to
> > get them to work properly.
> >
> > > If you run x with verbose logging (can't remember the command line
> > > option off the top of my head), it will give you endless detail on
> > > what your monitor returns as acceptable modelines and (most
> > > importantly) the description it uses for those in-built modelines. So
> > > for example, my Xorg/monitor combination has an 'inbuilt' modeline
> > > that it calls 1920x1080_100i - for PAL 1080i.
> > >
> You have a monitor capable of 100Hz, wow!

the new sharp Aquos run at 120hz.

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