[mythtv-users] No Display

[Andy]

So I added DebugMode to my xorg.conf file, and I honestly don't really know how to interpret the log.  There are a whole lot of "mode is valid"s and a whole lot of "mode is invaild"s.  It certainly seems like the TV EDID is being properly detected and the NVIDIA card is making the right choice.  I don't remember if I mentioned that I did go through and change the resolution through the NVIDIA control panel with no change.
Using a different myth box made no difference (although that uses the same NVIDIA drivers).  
I did change my audio output to go out the headphone jack instead of through the HDMI cable.  When I did that (using the internal player), the sound came from the speakers, but no video was displayed.  That makes it seem like maybe it is a configuration problem.

From: Andre <mythtv-list at dinkum.org.uk>
Date: February 6, 2011 4:27:08 AM CST
To: Discussion about MythTV <mythtv-users at mythtv.org>
Subject: Re: [mythtv-users] No Display
Reply-To: Discussion about MythTV <mythtv-users at mythtv.org>


On 6 Feb 2011, at 10:02, Andy wrote:

Thanks Andre,
I never made any changes to xorg.conf.

Ok, just thought it might be related.

 I don't understand how a resolution or display issue could be the problem when the video switches on immediately with the addition of audio in any mode.  I can open a mp3 on the desktop, and the display will work until that mp3 ends.

There's lots of possibilities where detection of the hdmi audio capability messes up other modes. I'll admit I couldn't really follow your explanation of the problem and just wondered if you had some old tweaks in there that was confusing the situation. If your configuration was overriding the tv's edid completely then your video card wouldn't configure hdmi audio until something overrode it, combine that with a TV that's picky and what I understood of your scenario is possible.

I certainly had some very odd interactions going on with my GT220 when hdmi audio support was added, my Onkyo amp (since scrapped) would go crazy when given 1080p50 with hdmi audio, 1080p60 with audio was fine but that's useless with European TV.	

Good luck with it, I'd start by adding verbose mode reporting to X and look at what your TV is telling you it can support, many of them lie profusely.

In your Device section in xorg.conf
Option "ModeDebug" "yes"

Andre

From: Andre <mythtv-list at dinkum.org.uk>
Date: February 6, 2011 3:19:50 AM CST
To: Discussion about MythTV <mythtv-users at mythtv.org>
Subject: Re: [mythtv-users] No Display
Reply-To: Discussion about MythTV <mythtv-users at mythtv.org>


On 6 Feb 2011, at 08:47, Andy wrote:

Well, the idea that it is a TV-side problem seems to make the most sense.  This myth box was setup to a different TV (through HDMI) with no problem, and the new TV is the only thing different.  A little bit of experimentation demonstrates video clicking on anytime audio accompanies the picture.

Did you make any customisations to your video settings (xorg.conf) for the old tv? If so it's possible the new tv has slightly different capabilities and mythtv is switching to a mode that the tv does not support.

Andre



      
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mythtv.org/pipermail/mythtv-users/attachments/20110206/b3df0fd4/attachment.htm>