How to report DVI/HDMI support to Xrandr?

Matthias Hopf mhopf at
Tue Mar 11 05:29:03 PDT 2008

On Mar 11, 08 07:19:23 -0400, Endejan, Edward wrote:
> I see what you mean, and I think that could work for my purposes, but I
> think it depends on what that property is called. If it is
> SIGNALLING_LEVEL as I had seen proposed, the level doesn't differ
> between DVI and HDMI, they are both TMDS. If it is called SIGNAL_FORMAT
> as you suggest, then TMDS-DVI, TMDS-HDMI, and TMDS-HDMI-13 make sense to
> me.

I proposed to call it RANDR_SIGNAL_FORMAT. I export this property in
radeonhd (though it's not fully implemented).

> > > data. I still think that an Output Property would be a good method to
> > > report this information though, so I'm proposing to create a new Output
> > > Property called HDMI_AUDIO which would be set to TRUE when that
> > > functionality is supported. Are there any objections to this approach?
> > 
> > Hm. Sounds reasonable.
> Other properties such as COLOR_DEPTH and COLOR_SPACE could be used with
> this approach to cover the other attributes you mentioned. Either way
> will work for me. Anyone else have a preference of which approach to
> use?

I would go for RANDR_SIGNAL_FORMAT first, but you can implement both if
you'd like to.

> I've seen it work as well on a desktop running Fedora Core 8, but I'm
> still struggling with getting it to work on my target system (VIA
> EPIA-EX15000G).

Ah, I see.

Good luck


Matthias Hopf <mhopf at>      __        __   __
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