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Old 07-24-05, 02:22 PM   #1
philipl
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Default non-hdv component out on 6600(gt)?

Hi all,

I've a got a 6600gt in my desktop right now and it has component out, officially for hdtv modes. However, I only have a bog-standard tv, but it has component in, so I'd really like to use the component connection rather than svideo.

Now, in vga/vesafb mode, everything works fine and looks great, but when I start X, the colours go all wrong. My understanding is that this is due to the different colourspace in hdtv (in my particular case the blue is way oversaturated and the red is barely detectable). Now, because the vga/vesafb output is correct, I know there is no hardware limitation here. The problem is in the drivers.

Ideally I'd expect to see TVOutFormat = Component but this isn't supported. Any hope this can get addressed?
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Old 07-25-05, 10:32 AM   #2
davemoore
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Default Re: non-hdv component out on 6600(gt)?

Comment out TVOutFormat from your config file and try:

Option "TVStandard" "HD480i"

or

Option "TVStandard" "HD480p"

What model TV do you have?
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Old 07-25-05, 11:05 AM   #3
philipl
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Default Re: non-hdv component out on 6600(gt)?

Quote:
Originally Posted by davemoore
Comment out TVOutFormat from your config file and try:

Option "TVStandard" "HD480i"

or

Option "TVStandard" "HD480p"

What model TV do you have?
HD480i is actually the first thing I tried but the results are identical with the wrong colouring.

As it's a bog standard SDTV, 480p is not going to work. It's some mid-range Sony; can't remember the model number.
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Old 07-31-05, 04:59 PM   #4
philipl
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Default Re: non-hdv component out on 6600(gt)?

So I finally got round to rebooting into windows and (naturally) the windows drivers handle this case fine. What I observed was that turning on TV-out and selecting NTSC resulted in the blue-skewed image that I had in linux but when I switched to "480i SDTV", it corrected itself and everything worked great. So clearly there's a linux issue - either in the driver or I haven't worked out the magic set of paramters to pass the driver. Grr.
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Old 07-31-05, 06:11 PM   #5
philipl
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Default Got it!

Ok, I made it work. The key is that the maximum X resolution being sent to the TV must also be a proper HDTV mode - of course, in my case, it's an SDTV but 480i means 720x480. Previously, I had the 1024x768 and 800x600 modes defined because those will work with regular TV out.

I also noticed that it's possible to define 640x480 as an extra TV mode but setting the overscan high enough to fill my TV causes the picture stability to take a long walk off a short pier so only 720x480 is really usable - and that's fine.

The clue for me was that the windows driver forced the screen resolution to 720x480 and wouldn't let me change it.

It's possible that people having problems with real HDTV modes might be running into this as well.
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Old 08-01-05, 12:28 PM   #6
Shplad
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Default Re: Got it!

philipl:

Your situations sounds very interesting. Thanks for your post. I wonder whether I may be coming up against the same problem, but under diff. circumstances. It would help me to see your config. file. Any chance you might share your X file with us?

Thanks


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Quote:
Originally Posted by philipl
Ok, I made it work. The key is that the maximum X resolution being sent to the TV must also be a proper HDTV mode - of course, in my case, it's an SDTV but 480i means 720x480. Previously, I had the 1024x768 and 800x600 modes defined because those will work with regular TV out.

I also noticed that it's possible to define 640x480 as an extra TV mode but setting the overscan high enough to fill my TV causes the picture stability to take a long walk off a short pier so only 720x480 is really usable - and that's fine.

The clue for me was that the windows driver forced the screen resolution to 720x480 and wouldn't let me change it.

It's possible that people having problems with real HDTV modes might be running into this as well.
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Old 08-01-05, 11:35 PM   #7
philipl
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Default Re: non-hdv component out on 6600(gt)?

Well, first off, I was slightly wrong about the allowed modes. Turns out that it will accept 800x600 fine while it's 1024x768 that confuses it.

I've attached my xorg.conf.
Attached Files
File Type: txt xorg.conf.txt (8.3 KB, 373 views)
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