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Thread: Is DVI really Plug and Play?

  1. #1
    X10
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    Is DVI really Plug and Play?

    Hi all, as the subject suggests, I thought I'd ask some of the experts here on Hexus.

    The main reason refers back to my original problem (here: http://forums.hexus.net/help-technic...ktop-help.html) and a Live Chat I had with XFX's support members (copied below).
    What he ultimately said was that you can't disconnect a DVI Cable from a graphics card running nVIDIA drivers and plug it back in while the PC is on and have the signal come back to the monitor. Apparently it is a 'feature' of DVI and nVidia's drivers to disable the DVI signal.

    Is this something that you guys have come across, this seems a little backwards as far as technology goes!?

    All comments welcome.

    X10

    TICKET #:
    217628
    TONY-Hi. Welcome to XFX-Live. How can I help?
    X10-Hello, I am having an issue with the image from my graphics card, and I cannot ascertain if it is the monitor, the graphics card or some other problem, do you think you could help me?
    TONY-hi, sorry to hear you are having difficulties, please can you explain in more detail what is happening and any changes you made since it started?
    X10-If I disconnect the DVI cable from the graphics card, while the the computer is on, then reconnect the DVI cable back into the graphics card, the picture will not display. The monitor goes into Stanby, as if there was no signal coming into it. If I then reboot/shutdown and restart the PC, the monitor still gets no signal. I have to boot into Safe Mode, then re-install the Graphics Card Drivers to get the monitor to display an image again.
    TONY-HI, yes, you should keep the cable connected whilst the PC is on. If you have 2 monitors cennected, you should disable iin the nvidia panel before disconnecting
    X10-I only have 1 monitor connected. The monitor is plug and play and I do not see any reason why I would have to re-install the drivers just because I disconnected the monitor. Also, I have asked a numberof other people with this graphics card and monitor and they say they have not experienced the problem I am having, which is why I suspect a fault. But I was hoping you could shed some more light as to why this happens.
    TONY-digital connection is different, once disconnected, you have to re-enable in the nvidia panel
    X10-Okay, how do I re-enable in the nVidia panel?
    TONY-you need a monitor connected to re-enable the display in the nv panel
    X10-Okay, so let me see if I understand you correctly.
    X10-If I have just one monitor connected and I disconnect it, it is a *normal feature of DVI* to stop sending a signal to the monitor, even if you re-connect it back into the DVI port?
    X10-If I then want to re-enable that monitor, I would need a *second* monitor *already* plugged into the second DVI port to be able to access the nVidia control panel?
    TONY-issue is straigtforward, please do not disconnect monitor without either turning the PC off or disabling in the nv panel. Yes, with digital monitors, it will not automatically enable
    X10-And what about, if I shut down the PC, disconnect the DVI monitor, connect it to a TV, watch something on the TV, then shut down PC again, connect back to DVI Monitor, should the monitor work?
    TONY-do you mean TV from s-video socket? that will not work either, again, as you need to enable the TV in the nvpanel. Best way is to have both connected to start with, then switch between the 2 when required
    X10-Yes, TV from the S-Video socket, I find that I can disconnect DVI, reboot with TV working, but then when I shutdown and go back to Monitor it will not show an image.
    X10-So why does Safe Mode work with the monitor, but not booting up normally?
    TONY-in this case, solution is not to disconnect
    TONY-in safe mode, nvidia drivers are not governing the displays
    X10-So is the problem actually something to do with nVidia drivers, rather than the DVI technology itself?
    X10-Or is this a limitation of the DVI technology?
    TONY-down to both really, nv drivers designed this way to have best control over the displays
    X10-Is there anyway to re-enable a DVI monitor before it is connected?
    X10-The reason I am asking all this is because I like to disconnect my PC, take it to my living room and watch films etc. on my TV sometimes. This means I cannot have both connected at the same time. As I didn`t have any problems when using my old VGA connector on my old graphics card (this is my first DVI capable graphics card and monitor) I found it odd that I can`t just go from one to the other as I had done previously - It seems like a step backwards in technology!
    TONY-no way round this I`m afraid, unless you dont install the drivers
    TONY-possibly older drivers may not be so particular, why not try the driver archive at nvidia.com? but the fact is that with video drivers being programmed more to be in line with windows drivers architecture, this is the way forward
    X10-If I don`t install the drivers, will the monitor function properly?
    X10-Sorry, not the `monitor` the ` graphics card`
    TONY-it should stil function, but the display will not be so good and no nvpanel to adjust properties, configuation, etc. Also, performance will suffer
    TONY-but even if you wish to move the TV, still nota problem keeping monitor connected?
    X10-I only take the base unit to the living room. I don`t want to have to lug a 22` monitor as well. I see there is no option to re-connect besides what I have been doing which is re-installing the drivers from Safe Mode - If, as you say, this is the new `functionality` with DVI and nVidia drivers. This is a real shame and a step backwards in technology.
    TONY-sorry we cant hep you with this one, but anything else, please let us know
    X10-Thanks.

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    Re: Is DVI really Plug and Play?

    Mmm, I have a Radeon 4850 which is driving a Dell 30" panel at 2560x1600 i.e. dual link. I just pulled the DVI cable out running Vista desktop and the monitor started colour cycling.

    When I plugged the cable back in, the display returned ? Slightly puzzled why Nvidia drivers would disable the output if signal was disrupted ? can't see the point, doesn't save any power and reduces the robustness of the DVI signal [cables fall out etc.].

    Sorry, haven't an nVidia card to test here.

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    Re: Is DVI really Plug and Play?

    Same here, I've pulled out the DVI cable on my monitor before and when I put it back in it continues like normal with the display.

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    Re: Is DVI really Plug and Play?

    Got a 9800GTX+ at home, will happily test it out for you. But from memory, I've done this before and the display 'returned' fine.

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    Re: Is DVI really Plug and Play?

    It should be PnP, although I have the odd glitch with my 8800GTX which got relegated to a spare PC 6 months ago.

    Installing drivers was a matter of luck, half the time the screen went black and never came back although the PC was fine and I could finish the install off as long as I remembered the keystrokes to press the correct buttons!

    Also, occasionally when resuming from powersaving the monitor display would go nuts as if the gfx card was faulty.....turning the monitor off and back on resolved it though.

    Had no problems at all since switching to an AMD card....So there may be some mileage in what XFX say (at least to some degree)
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    Re: Is DVI really Plug and Play?

    When I had my 8600 GTS, the picture didn't return and I had to reboot to get it back, no problems with my HD 4670 though

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    Re: Is DVI really Plug and Play?

    I've pulled mine out, changed the connector and everything, i was quite impressed that it kept everything correct when i switched the outputs around on the fly
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    X10
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    Re: Is DVI really Plug and Play?

    Well I am running a XFX8800 GTS so I'm in the same boat as Gfinch here.
    It would seem there is some BS as to the XFX tech guy but also seems to be a problem perhaps related to XFX boards and the 8800GTS in particular?

    I have to say it is a very very annoying thing to have to reboot and reinstall drivers if I don't shutdown when disconnecting the monitor.

    X10

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    Re: Is DVI really Plug and Play?

    Have never heard of or experienced an issue like yours. Only problems i have is when i pull out and switch to a different resolution monitor on-fly it skews, but then resets.

    I'd say there is a problem with your card if you are having to re-install the drivers.

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    Re: Is DVI really Plug and Play?

    My Quadro certainally doesn't do this. I've unplugged my monitor a few times to change cables about etc without a problem.

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    Re: Is DVI really Plug and Play?

    Quote Originally Posted by X10 View Post
    Apparently it is a 'feature' of DVI and nVidia's drivers to disable the DVI signal.
    DVI has a pin dedicated to hot swap detecting (pin 16), so the DVI interface fully supports it.
    As for nVidia - I can hotswap on my nVidia cards without issue.

    I wouldn't take their comments too seriously.

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    Re: Is DVI really Plug and Play?

    I have a 8800GT and have no problems here.

    I have found XFX support to be poor in the past. Is there a particular requirement you have, where you need to unplug your monitor regularly?

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