G35 HDMI with Intel driver through a HDMI 4-1 switch

Petri Helin phelin at googlemail.com
Sat Aug 30 02:45:53 PDT 2008

On Fri, Aug 29, 2008 at 9:21 PM, Petri Helin <phelin at googlemail.com> wrote:
> Hi,
> I have a Asus P5E-V HDMI motherboard, based on G35 chipset. The board has
> VGA, DVI and HDMI connections. VGA works splendidly, DVI I haven't tested,
> but HDMI is causing a lot of trouble.
> I tried with HDMI connection from the computer to a video projector thru  a
> HDMI-switch. This worked with my previous set with nvidia display card, I
> could even see that EDID came all the way to the nvidia card. Now, with
> Intel IGP, the projector is no more recognized. Executing xrandr it reports
> that I have a VGA and a TDMS-1 monitors.
> Then I connected the HDMI straight to the projector. Now xrandr reports VGA
> and HDMI-1 monitors, but still EDID is not being read or at least there are
> no entries in Xorg.0.log that would imply it. Though it sets the resolution
> to 1280x720 at 60 which is the native resolution. For VGA monitor there are
> entries in the log for EDID being read. Still, now I got picture to the
> projector.
> I have tested with both the driver which comes with Ubuntu 8.04 (version
> 2.2.1) and version 2.4.1. No difference.
> Questions:
> 1. What is the difference between TMDS and HDMI?
> 2. Why doesn't it work when the switch is in between the computer and the
> projector?
> -Petri

Well, I should have tested a bit more...  I switched back to using the
switch betwenn the computer and the projector, and now it works. I
cannot fathom why it didn't work earlier. Must have been just a loose
cable or something.  The connection is still named TMDS-1 instead of
HDMI-1, though.


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