[mythtvnz] Xorg and Intel HD 630 graphics -- please help!

[Stephen Worthington]

On Sat, 1 Sep 2018 14:27:25 +1200, you wrote:

>I've just changed CPU and motherboard for my MythTV machine, and having no
>luck at getting it to output a video signal to the TV.  Anyone else have a
>similar set-up to this?
>
>OS is Linux, an Ubuntu derivative.
>
>The graphics card used to happily drive two outputs. I use the DVI output
>for console, and the HDMI for the TV.  The old setup was an Asus GT 430
>graphics card and it worked fine; with the new Intel HD 630 built-in one
>I can only get it to set up one Xorg screen (or none!)
>
>The "Xorg -configure" command fails, complaining about "no devices".
>All my attempts at a manual Xorg.conf file produce either a working console,
>with no TV output, or nothing at all (hangs during start-up)
>
>We've had no TV to watch for several days, and SWMBO is not very pleased!   :)

The obvious immediate answer to that problem is to put the GT430 card
back in the box, if possible.  But the Intel GPU should work, even if
its deinterlacing will not be as good as the Nvidia card as MythTV
does not support the way Intel does the higher deinterlacing modes.  I
have not used a modern Intel GPU recently, but I have an older one in
my laptop (i7-3610QM processor) and I have never had any problems
making it work with MythTV.  I did not need to use any settings in
Xorg.conf - it just worked.  I do not think I have ever tried it with
multiple monitors though.

How are you connecting things?  Having monitors and TVs work properly
relies on the EDID data.  My TV produces reasonable EDID data, so I do
not need to override it in settings anywhere, but some TVs are very
bad.  Monitors tend to have better EDID data than TVs, but can have
bad data also.  And the data needs to get through to the PC - so a
direct cable is best to try first, rather than through any HDMI
devices like amplifiers or switches.