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Old 04-12-2013, 05:49 PM   #1
Tsali
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I can't seem to be able to get a dual screen to work.


I have a desktop and a tv that is capable of supporting a computer signal. I purchased a VGA splitter and a connector with both S-video and RCA connectors from which I ran a S-video cable from to my tv yet there is no picture.

I'm not sure if the hardware can support such a thing and I'm not sure how to check on Linux either. I do know when I had windows I used to hook it up via the S-cable and had a perfect picture. The tv is an older tv so there is no HDMI ports or anything like that.

Is there a way to check and see if I have the right board to do such a thing and if so how to get it to work without having to buy a converter?
 
Old 04-13-2013, 10:16 AM   #2
qlue
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To get data about your installed graphics card hardware:
Code:
hwinfo --gfxcard
However, since the vga standard does not have any inherent compatibility with s-video, you will need to consult the manufacturer's spec sheet to be certain.
If your graphics card does support s-video, but needs a propriety driver to do so, you may be out of luck. Linux drivers are part of the kernel and unless the manufacturer provides a propriety driver for Linux, there is no way to include it.

A further note;
The pins used by non-standard vga cards for s-video are usually connected to ground on a standards compliant card. Connecting them to an s-video input will most likely result in a blank, black screen as the display will interpret this as a 'flatline' signal rather than as no signal.
 
Old 04-13-2013, 11:05 AM   #3
Tsali
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So, basically what you're telling me is just because I did it on my old HP through a s-cable from a NiVidia graphics card that I may not be able to do it at all with my Linux and graphics card I have? I just want to make sure I'm understanding you right is all.
 
Old 04-14-2013, 08:17 AM   #4
qlue
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Yes, that is exactly what I am saying. S-video signals on a vga port are a not part of the vga standard.
This doesn't mean you can't get it to work, but it does mean that it may not be possible with your current hardware.
Of course, things are not as bad as they were back in the Eighties. There were no standards back then and every computer manufacturer did there own thing!

One extra point; Modern graphics cards are based on fpga technology. They can be re-wired by firmware to do almost anything! So even if a given graphics card does not ship with an s-video option, it could possibly acquire that via a firmware upgrade. It all comes down to what the manufacturer is willing to do. And Linux desktop boxes are not a top priority for manufacturers. (they make more money from Windows desktops)
 
Old 04-15-2013, 06:11 AM   #5
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If it's an nVidia card then the proprietary nVidia drivers tend to be pretty feature-complete. There should also be an nVidia configuration utility. Install drivers and utility from the ubuntu repos, then hopefully you'll be able to set things up how you like.
 
Old 04-15-2013, 07:07 AM   #6
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This is from another post by Tsali
Quote:
01:05.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RS690 [Radeon X1200 Series]
I am no sure how well supported ATI Radeon RS690 is under Linux at this time.
 
Old 04-15-2013, 07:18 AM   #7
Tsali
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Im sorry for the misunderstanding Cantab. The nividia card was on an old HP I had. Not on the Linux system I have now. As Tron mentions I have a different card then the Nividia one that was in my HP. That's why I wasny sure if the hardware I had was able to do what Im trying to do or not. Thank you for clearing that up Tron.
 
  


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