[mythtv-users] xorg.conf for Nvidia and DVI to HDMI cable.

Justin The Cynical cynical at penguinness.org
Mon May 4 11:09:52 UTC 2009

clemens at dwf.com wrote:
> What should I be saying in my xorg.conf If I want to use an Nvidia
> card and have a DVI to HDMI cable?  Seems I should be saying 
> something about digital output, but I dont see any such options.

In theory[1], nothing at all.

HDMI = DVI with audio in the signal

 From wikipedia 

"A DVI signal is electrically compatible with an HDMI video signal; no 
signal conversion needs to take place when an adapter is used, and 
consequently no loss in video quality occurs.[3] As such HDMI is 
backward compatible with Digital Visual Interface digital video (DVI-D 
or DVI-I, but not DVI-A) as used on modern computer monitors and 
graphics cards. This means that a DVI-D source can drive an HDMI 
monitor, or vice versa, by means of a suitable adapter or cable. 
However, the audio and remote-control features of HDMI will not be 
available.[3] Additionally, not all devices with DVI input support 
High-bandwidth Digital Content Protection (HDCP). Without such support 
by the device, an HDCP-enabled signal source will suppress output and so 
prevent the device from receiving HDCP-protected content.[94] All HDMI 
devices must support sRGB encoding.[95]"

When I moved my machine from component out to HDMI, I picked up a DVI to 
HDMI cable, commented out the lines dealing with component and TV out 
and restarted X Windows.  That was it.  The 7300 in the system detected 
a digital flat panel and Just Worked(tm).

Of course, not all HDMI televisions will send the correct data, if any, 
so YMMV.

[1] This assumes that the television sends the correct EDID data,
     if any, to the computer, if the computer does query the television.
     If either side does not, you might have to mess with mode lines.

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