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How to force hdmi output in R6?
http://forums.linhes.org/viewtopic.php?f=11&t=20437		 Page 1 of 1
Author:  Ozdemon [ Tue Oct 27, 2009 10:21 pm ]
Post subject:  How to force hdmi output in R6?
I have my htpc connected to an lcd tv thru hdmi. If I turn on the tv first, select source hdmi and then switch on the computer all is well. However if I forget to do it in that order, or I need to reboot, then the htpc fails to output a hdmi signal and so nothing appears on the tv.

Is there a way to force my htpc to output hdmi so that it does not matter if I (or more likely my spouse) forget to turn the tv on first?

Tks.
Author:  jzigmyth [ Thu Oct 29, 2009 8:00 am ]
Post subject: 
What you need to do is customize your xorg.conf to specify your connection explicitly with something like this in the Monitor or Device Section
Code:
    Option "ConnectedMonitor" "DFP"
This example will use the DVI output.

You will also need to specify a mode line for your TV in the Monitor Section, and then reference that mode line by name in the Display Subsection of the Screen Section.

And because your TV is not connected when you start X, you need to disable Validation by adding a ModeValidation line to the end of the device section
Code:
     Option "ModeValidation" "NoHorizSyncCheck, NoVertRefreshCheck, NoDFPNativeResolutionCheck"


I'll include my xorg.conf for reference, but I have a custom mode line for my TV and a much longer ModeValidation line because I am overclocking my Nvidia FX5200 so it can do 1080p.
Code:
# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 1.0  (buildmeister@builder3)  Tue Aug  1 21:11:12 PDT 2006
Section "ServerFlags"
        Option "AutoAddDevices" "False"
EndSection

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
EndSection

Section "Files"
#    RgbPath         "/usr/X11R6/lib/X11/rgb"
EndSection

Section "Module"
    Load           "dbe"
    Load           "extmod"
#    Load           "type1"
    Load           "freetype"
    Load           "glx"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "keyboard"
EndSection



Section "Monitor"
   Identifier   "Monitor0"
   Option   "DPMS"   "true"
   Option "UseEdidDpi" "FALSE"
   Option "DPI" "100 x 100"
       Option  "ConnectedMonitor" "DFP"
   HorizSync 30 - 81 # DDC-probed
   VertRefresh 56 - 76 # DDC-probed
   ModeLine "ATSC_1080_59.94p2" 148.352 1920 2000 2056 2200 1080 1084 1088 1125
EndSection

Section "Device"
   ### Available Driver options are:-
# sw_cursor is needed for some ati and radeon cards
        #Option     "sw_cursor"
        #Option     "hw_cursor"
        #Option     "NoAccel"
        #Option     "ShowCache"
        #Option     "ShadowFB"
        #Option     "UseFBDev"
        #Option     "Rotate"
   Identifier  "Card0"
# The following line is auto-generated by KNOPPIX mkxf86config
   Driver      "nvidia"
   Option "XvmcUsesTextures" "false"
   Option "UseEvents" "true"
   VendorName  "All"
   BoardName   "All"
#   Option "NVAGP" "1"
#   BusID       "PCI:1:0:0"
   Option "ExactModeTimingsDVI" "true"
   Option "ModeValidation" "AllowNon60HzDFPModes, NoMaxPClkCheck, NoEdidMaxPClkCheck, NoMaxSizeCheck, NoHorizSyncCheck, NoVertRefreshCheck, NoWidthAlignmentCheck, NoDFPNativeResolutionCheck, NoVirtualSizeCheck"   

EndSection

Section "Screen"
   Identifier "Screen0"
   Device     "Card0"
   Monitor    "Monitor0"
   DefaultColorDepth 24
   SubSection "Display"
      Depth     24
      Modes "ATSC_1080_59.94p2"

   EndSubSection
EndSection

#Section "DRI"
#   Mode 0666
#EndSection

#Section "Extensions"
#   Options "Composite" "Disabled"
#EndSection
Author:  jzigmyth [ Thu Oct 29, 2009 9:29 am ]
Post subject: 
Warning:
Before you start changing your xorg.conf file, make a copy of it and make sure you can ssh in to your machine remotely and or have webmin setup and working from another computer. It's very easy to mess up xorg.conf so that you will have no working monitor on your mythbox!

It is easiest to be able to get in remotely from another computer to fix it.
Author:  Ozdemon [ Sat Oct 31, 2009 2:49 pm ]
Post subject:  hdmi blues
Thanks very much for your replies, but it looks way too tricky for me to do, I never would have guessed that
Quote:
Option "ConnectedMonitor" "DFP"
would output DVI, let alone what the correct code would be for hdmi.

I think I will have to put up with remembering the correct switch on order and just tell my spouse that there is no other way. :oops:
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