[mythtv-users] No Display

Sun Feb 6 10:27:08 UTC 2011

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
>> 
>>> 
>>> Thanks Ian.  My questions will now take a different tack to a different audience.
>>> 
>>> --- On Sun, 2/6/11, Ian Latter <ian.latter at midnightcode.org> wrote:
>>> 
>>>> From: Ian Latter <ian.latter at midnightcode.org>
>>>> Subject: Re:[mythtv-users] No Display
>>>> To: "Andy" <mizeraka at yahoo.com>
>>>> Cc: mythtv-users at mythtv.org
>>>> Date: Sunday, February 6, 2011, 3:09 AM
>>>> 
>>>> Hello,
>>>> 
>>>> 
>>>>  You've gone further than I have in debugging - I
>>>> have just
>>>> converted my AV/Stereo setup to HDMI too, but the HDMI
>>>> Amp that I bought last year won't forward the picture to
>>>> the
>>>> set, so I've just skipped that until my patience returns
>>>> ;-)
>>>> 
>>>>  Is it possible that the TV/Display is only
>>>> configured to show
>>>> a picture when it has audio?  I suspect this is/was
>>>> the
>>>> problem with my Amp (I only just bought and configured an
>>>> nVidia GT220 (216) so that I have both picture and audio
>>>> in the same cable - two days ago).
>>>> 
>>>>  My old 4:3 set used to display a blue screen when it
>>>> 
>>>> detected no signal - maybe your TV is doing a modern 
>>>> equivalent ... Try exploring the TV's config options ..
>>>> 
>>>>  Actually one other thought .. my set had 4 x HDMI
>>>> inputs,
>>>> and one was specifically flagged as a PC HDMI interface ..
>>>> maybe you've just seen why that's important?  I
>>>> haven't
>>>> tried one of the other HDMI ports ...
>>>> 
>>>> 
>>>> 
>>>> Good luck,
>>>> 
>>>> 
>>>> ----- Original Message -----
>>>>> From: "Andy" <mizeraka at yahoo.com>
>>>>> To: <mythtv-users at mythtv.org>
>>>>> Subject:  [mythtv-users] No Display
>>>>> Date: Sun, 06 Feb 2011 00:00:26 -0800
>>>>> 
>>>>> Hi guys,
>>>>> I am in full crisis mode!
>>>>> 
>>>>> I just bought a new television and spent about 2
>>>> hours
>>>> mounting it to the wall.  It is an LG 37inch LED LCD
>>>> TV with
>>>> 1080p and 120 Hz refresh capable.
>>>>> 
>>>>> I finally hooked it up to my mythtv box (which is
>>>> running
>>>> 0.24 in a mythbuntu package).  I got a message from
>>>> the TV
>>>> saying "No Signal".  I rebooted mythtv and rechecked
>>>> the
>>>> connections.  I saw the splash screen displayed, and
>>>> then
>>>> the "No Signal" message again.
>>>>> 
>>>>> I opened the mythtv box in VNC just to confirm it was
>>>> on.
>>>> It was.  I tried "Play music" and lo and behold, I
>>>> had
>>>> sound and picture.  It worked like normal.  But
>>>> when I
>>>> exited back to the mythtv menu, I got the "No Signal"
>>>> message.
>>>>> 
>>>>> VLC (which is what I am using to watch videos) gives
>>>> me a
>>>> signal which I lose when I exit VLC.  I can watch live
>>>> TV
>>>> and recorded programs with the internal player, but I
>>>> cannot
>>>> see the desktop or the mythtv.
>>>>> 
>>>>> Things I have tried:
>>>>> Changing the resolution.
>>>>> Changing the configuration in the NVIDIA panel
>>>> (although
>>>> I'm not sure I know EXACTLY what I was doing in there).
>>>>> Changing my theme.
>>>>> Opening Mythtfrontend while a VLC window is playing
>>>> (this
>>>> is the closest to success I have come... I can see the
>>>> desktop and enter mythtv, but once that VLC window closes,
>>>> I
>>>> get the "No Signal"message.
>>>>> 
>>>>> 
>>>>> Thank you for taking a look at this and for any
>>>> advice.
>>>>> 
>>>>> 
>>>>> 
>>>>> _______________________________________________
>>>>> mythtv-users mailing list
>>>>> mythtv-users at mythtv.org
>>>>> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>>>>> 
>>>> 
>>>> 
>>>> --
>>>> Ian Latter
>>>> Late night coder ..
>>>> http://midnightcode.org/
>>>> 
>>> 
>>> 
>>> 
>>> _______________________________________________
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>>> mythtv-users at mythtv.org
>>> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>>> 
>> 
>> 
> 
> 
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