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PostPosted: Tue Jan 29, 2008 9:00 pm 
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Posts: 6
This is a tale of two KnoppMythboxen. The output device is a Toshiba 44NHM84 DLP television over its VGA or DVI input (we've tried both). The television does not like conventional 720p modelines.

Box 1 ("divx", R5F1) has an NVIDIA FX 5500 AGP video card, and outputs successfully using the following modeline:

Modeline "1360x768" 84.750 1360 1384 1520 1776 768 779 784 798 -hsync +vsync

Box 2 ("BigDivx", R5F27) has an eVGA NVIDIA 7200 GS PCI-E video card. It is running the same version of X, the same NVIDIA drivers (8776, though 169.09 have also been tried), and the same modeline listed above. However, when run with this modeline, the TV reports "No Signal". An NVIDIA 7800 GT was also put into this system. It too did not work with the above modeline, but did work with this modeline:

Modeline "1280x768" 80.14 1280 1304 1440 1680 768 769 772 795

The 7200 GS was put back in the system and tried with the 1280x768 modeline, but the "No Signal" error recurred, with all combinations of hsync/vsync. The highest resolution I've been able to get is 1024x768. Attempts to go any wider than this fail.

Both the VGA and DVI outputs from the card have been tried. The limitation appears to be with the video card, but I can't figure out how. Any ideas on what magical incantation may be required to get the high-def output from the 7200 GS?


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PostPosted: Wed Jan 30, 2008 6:53 pm 
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Joined: Fri May 21, 2004 11:55 pm
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Location: Silicon Valley, CA
A look at the logs should reveal why Xorg isn't using a particular modeline. It will say why it bypassed your 720p modeline. Also, I think the 7xxx series is pretty new and will need a newer driver than 8778, but I could be wrong...

Joe

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PostPosted: Wed Jan 30, 2008 8:26 pm 
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Joined: Thu Mar 25, 2004 11:00 am
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Location: Arlington, MA
The CheckingLogFiles page on the wiki includes details of how to find this information.


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PostPosted: Wed Jan 30, 2008 11:24 pm 
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Already tried that with the logs and everything, since a skipped modeline was my first inclination. But that was ruled out by (1) X not reverting to a lower modeline when one was supplied as an acceptable mode, and (2) the log clearly showing that the requested modeline was being used. However, whatever *this particular* video card (or card and driver combination) is outputting isn't being recognized by the television. The card otherwise works fine, i.e., at 1024x768.

As far as I can tell, the requested mode meets all the requirements of the card; horizontal and vertical resolution are in range, and both are divisible by eight. And the nvidia driver accepts this as a valid modeline for this card.

P.S.:
Code:
(II) NVIDIA(0):   Validating Mode "1360x768":
(II) NVIDIA(0):     1360 x 768 @ 60 Hz
(II) NVIDIA(0):     Mode Source: Custom ModeLine
(II) NVIDIA(0):       Pixel Clock      : 84.75 MHz
(II) NVIDIA(0):       HRes, HSyncStart : 1360, 1384
(II) NVIDIA(0):       HSyncEnd, HTotal : 1520, 1776
(II) NVIDIA(0):       VRes, VSyncStart :  768,  779
(II) NVIDIA(0):       VSyncEnd, VTotal :  784,  798
(II) NVIDIA(0):       H/V Polarity     : -/+
(II) NVIDIA(0):     Mode is valid.


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PostPosted: Thu Jan 31, 2008 7:48 am 
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Joined: Fri Apr 02, 2004 10:08 am
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Location: Virginia, USA
Playing with modelines is great fun and all, but are you sure that the built-in HD modes present in recent Nvidia drivers don't work?

http://www.mythtv.org/wiki/index.php/Mo ... r_ModePool

Does the TV literally not work with a device outputting 720p? It should from its specs. If you can set a set-top box or upscaling DVD player to 720p and it works, then the 720p Nvidia mode should work.


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PostPosted: Thu Jan 31, 2008 9:18 am 
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Yep, tried the modepool 720p modes--note that this is not on TV out, though, but the TV's VGA/DVI inputs, which discriminate between PC and home theater components.

The PS3 connected at 720p via HDMI->DVI works fine, but uses the TV's DVI-DTV mode (if set to DVI-PC, the picture is garbled), whereas for the computers, the TV must be set to the RGB-PC (VGA) or DVI-PC modes. An upconverting DVD player would presumably also use the DTV mode.

I believe I tried setting the TV to the DTV mode while running a 720p mode for the heck of it, but at this point I'm not sure. I didn't expect this to take a week to figure out, so I didn't keep a notebook. I can go ahead and try it, though, though why the output type would fundamentally change just by setting a 720p mode is beyond me.

Of course, the native resolution of the TV is 1366x768, hence the 1360x768 choice for divx. I could never figure out how to get divx working with a standard 720p mode either.

There is the distinct possibility that there's a better forum for this question, so I'm open to suggestions if we're stumped here.

Liv2Cod: As noted in my OP, this is not the only driver I've tried; I've also used the hot-off-the-presses 169.09 driver (very first thing I tried was upgrading the drivers, followed by adding the logging and then realizing that something strange was going on), which is a 9xxx driver (as far as I can tell, it doesn't tell you the 4-digit version unless you install it, reboot, and then run dmesg | grep NVIDIA). Both drivers have the exact same performance with regards to this particular problem. I only downgraded to 8779 so that I could directly compare divx to BigDivx--I wanted the only substantive difference between the systems to be the video card. I'd swap the two cards, but we have an AGP vs. PCI-E problem with that, which is why I swapped another PCI-E card in, which to summarize, worked with a hybrid 720p/native resolution of 1280x768, but not at standard 720p and not at the native 1360x768.

Thanks to all who've responded so far.


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PostPosted: Thu Jan 31, 2008 10:01 am 
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Joined: Fri Jul 13, 2007 11:21 pm
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UPDATE: Got it working.

(Self-replying to make things obvious.)

For future searchers, the correct combination was the ATSC-720-60p mode from the Mythtv Wiki Modelines Database and the RGB-DTV input on the television. Beats me why (stupid TV). I initially tried the modepool 1280x720 and 1280x720_60, but they were apparently not in the pool with this version of the nvidia driver.

Thanks again all.


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PostPosted: Thu Jan 31, 2008 10:50 am 
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Location: Virginia, USA
Glad you got it working!


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