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Old 03-22-08, 04:23 PM   #1
Christophe Lohr
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Default TV-out by a separate framebuffer device?

Hi,
Is there a driver able to provide access to TV-out by a separate framebuffer device?

I tried playing with nvtv, nvidiafb and uvesafb, but without success... :-(

Many thanks

Last edited by Christophe Lohr; 03-24-08 at 05:13 AM.
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Old 03-26-08, 08:47 AM   #2
Christophe Lohr
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Default Re: TV-out by a separate framebuffer device?

In fact I want to play a video on TV output without monopolizing the linux virtual terminal.

The TV-out under Xorg works well. To use it, I have two ways:
- an X session, which manages both the CRT and TV.
- two instances of X in parallel, one for the CRT, one for the TV.

In the first case, TV output is binded to the Xorg user. If it leaves its X session, then the video stops.
In the second case, I have to to activate the virtual terminal attached to the X-TV to see the video. If so, the X-CRT is not available for any user ...
In short, none of these solutions is ok.

That is why I am looking for a solution "TV-out via framebuffer".
It's possible?
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Old 03-26-08, 09:35 AM   #3
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Default Re: TV-out by a separate framebuffer device?

There is no such a way and there won't be one in the foreseeable future. If you really want this behavior add a second videocard.
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Old 03-26-08, 04:28 PM   #4
Christophe Lohr
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Default Re: TV-out by a separate framebuffer device?

I'm not sure to understand.

Let's assume I have a second graphic card (let's say another NV), how should I configure my system?
Since the TV-out is only available via X, I still have to monopolize the linux virtual terminal to play a movie. Isn't it?

Thanks.
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Old 03-26-08, 05:11 PM   #5
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Default Re: TV-out by a separate framebuffer device?

You can have two Xservers running at the same time. You can also open apps from your desktop on the second card if you specify the correct DISPLAY variable.
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Old 03-27-08, 04:07 PM   #6
Christophe Lohr
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Default Re: TV-out by a separate framebuffer device?

Ok, one can have several Xserver process running in the same time, but only one is visible at the same time, since each one is attached to a virtual terminal, and one can view only one virtual terminal at the same time...
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Old 03-28-08, 03:36 AM   #7
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Default Re: TV-out by a separate framebuffer device?

On a single card you can only have one visible at a time because the nvidia driver can only output to one screen at the time. If you would connect an extra keyboard/mouse (or use the void input driver) it should come up I think.
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Old 03-28-08, 08:25 AM   #8
pgs
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Default Re: TV-out by a separate framebuffer device?

Quote:
Originally Posted by Thunderbird
On a single card you can only have one visible at a time because the nvidia driver can only output to one screen at the time. If you would connect an extra keyboard/mouse (or use the void input driver) it should come up I think.
Could you please elaborate this a bit more?

A single video card, with two outputs, for example DVI and TV-out, can display two different contents on the two outputs, for example using TwinView or dual Xserver. Or not?
So it will be technically possible, patching the Xserver (and not the driver), to achieve the result of having one user and one "anonymous" display output?
Or I'm missing something?

Thanks!

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Old 03-28-08, 02:19 PM   #9
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Default Re: TV-out by a separate framebuffer device?

A single nvidia videocard can't do that. Twinview is handled inside the video driver and the same for 'separate X screens'. Other videocards like e.g. ATI ones advertise 'two' videocards and they allow this. In case of nvidia the only way is to add a second videocard but I can't guarantee that it works (you could test it for fun using an old pci card).
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