[mythtv-users] DVI vs. S-Video

Harry Devine lifter89 at comcast.net
Wed Jan 16 01:54:38 UTC 2008

Phil Bridges wrote:
> On Jan 15, 2008 7:14 PM, Harry Devine <lifter89 at comcast.net> wrote:
>> Phil Bridges wrote:
>>> On Jan 14, 2008 8:01 AM, Harry Devine <lifter89 at comcast.net> wrote:
>>>>  Phil Bridges wrote:
>>>>  On Jan 13, 2008 8:36 PM, Harry Devine <lifter89 at comcast.net> wrote:
>>>>  Rich West wrote:
>>>> Harry Devine wrote:
>>>> Everyone,
>>>>  I currently have an EVGA nVidia based e-GeForce 7100GS video card in my
>>>> Myth box, and I'm using the S-Video out to push the TV-Out to my Samsung 46"
>>>> DLP HDTV. I've been thinking about this for a few days, and I believe that
>>>> I should be using the DVI connection from that card to my TV. I have 2 HDMI
>>>> inputs on my TV and 1 is being used to receive signals from my Comcast
>>>> Motorola STB.
>>>>  I'm a little unsure how to configure my xorg.conf file to do this. Also, I
>>>> suppose that I'll have to get a DVI-to-HDMI cable. Am I correct in this?
>>>> I'm adding my current xorg.conf file contents below, so if anyone has any
>>>> ideas, I'm all ears.
>>>>  The title of the Wiki entry is a bit misleading, but check out
>>>> http://www.mythtv.org/wiki/index.php/ComponentOut for details on how to get
>>>> this set up.
>>>>  -Rich
>>>>  Hey Rich!
>>>>  I just got around to getting the DVI->HDMI cable hooked up, and I can't get
>>>> it working from within Linux. When my Myth box reboots, I can put my TV on
>>>> HDMI2 and see the boot up process. However, once the X server starts, I get
>>>> nothing. I don't see anything in my /var/log/Xorg.0.log file that indicates
>>>> any problem. I tried to follow the link in the Wiki that you sent, as well
>>>> as the following article to no avail:
>>>> http://www.fedoraforum.org/forum/showthread.php?p=721770#post721770.
>>>>  Section "Device"
>>>>  Identifier "Videocard0"
>>>>  Driver "nvidia"
>>>>  VendorName "nVidia"
>>>>  BoardName "NVIDIA GeForce"
>>>>  Option "TwinView"
>>>>  Option "TwinViewOrientation" "Clone"
>>>>  Option "ConnectedMontior" "CRT, TV"
>>>>  Option "SecondMonitorHorizSync" "30-50"
>>>>  Option "SecondMonitorVerRefresh" "60"
>>>>  Option "TVStandard" "NTSC-M"
>>>>  Option "TVOutFormat" "Composite"
>>>>  As long as you tell your Xorg to send X out of the "Composite" output
>>>> of your card, that's where it will be output.
>>>> Read this: http://gentoo-wiki.com/HOWTO_Xorg_HDTV#Nvidia_Settings
>>>>  Apparently not, because that's what I have (see "TVOutFormat" above) and I
>>>> get nothing.  I did read that link you sent me (even though I'm on FC6 and
>>>> not gentoo), but it didn't really help much.  I appreciate you sending it
>>>> though.  Obviously I'm missing something, but I'm not sure what it is.
>>>>  Thanks,
>>>>  Harry
>>> Are you trying to send your desktop out over the composite output?
>>> Why have the DVI->HDMI cable, then?  Also, if you read through the
>>> sample xorg.conf in the link, you'd see that you need to set the
>>> "ConnectedMonitor"to "DFP" or "DFP0" rather than "CRT".
>>> xorg.conf is xorg.conf - it's (for the most part) distribution-independent.
>> No, I'm trying to send it out via the DVI connector on the GeForce card,
>> which is why I got the DVI->HDMI cable.  I only changed it to "Composite
>> because that was what one of the links sent to me in this thread
>> suggested.  I changed "ConnectedMonitor" to "DFP0" and "DFP", and I
>> still get a blank screen.
>> Any other ideas?
>> Thanks,
>> Harry
> Do you still have these lines?
> Option      "TVStandard" "NTSC-M"
> Option      "TVOutFormat" "Composite"
> Is the xorg you posted cut-and-pasted?  The reason I ask is because
> the "Connected Monitor" section is misspelled.
It was cut-n-pasted (I see the misspelling. Ooops!), but that option 
isn't in there any longer.  I took it out based on a few other peoples 
suggestions.  Here's the relevant sections as they exist right now:

Section "Monitor"
    Identifier  "Monitor0"
    VendorName  "Samsung"
    HorizSync   30.0 - 50.0
    VertRefresh 60.0 - 60.0

Section "ServerFlags"
    Option "blank time" "0"
    Option "standby time" "0"
    Option "suspend time" "0"
    Option "off time" "0"

Section "Device"
    Identifier  "Videocard0"
    Driver      "nvidia"
    VendorName  "nVidia"
    BoardName   "NVIDIA GeForce"
    Option      "RenderAccel" "1"
    Option      "NoLogo" "true"
    Option      "UseEvents" "True"

Section "Screen"
    Identifier "Screen0"
    Device     "Videocard0"
    Monitor    "Monitor0"
    DefaultDepth     24
    SubSection "Display"
        Viewport   0 0
        Depth     24
        Modes    "1280x720_60" "720x480_60"

Section "DRI"
    Group 0
    Mode  0666


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