[mythtv-users] Modelines

[PJR]

On 28/01/14 12:10, david brooke wrote:
> On Mon, Jan 27, 2014 at 8:50 AM, Robert Dege <livemotion at gmail.com
> <mailto:livemotion at gmail.com>> wrote:
>
>     Is it possible to use a custom Modeline if connecting to a TV over
>     HDMI?  I know that this article
>     (http://www.mythtv.org/wiki/Modeline_Database) says it's ignored
>     if TV-OUT has been configured, but I don't know if that applies
>     here, since HDMI can be used to connect to monitors as well.
>      Plus, I have no TV-OUT setup in the xorg.conf.
>
>     Both the mythfrontend UI, and TV playboack are larger than the
>     physical screen (overscan?).  I used the screen wizard in the
>     mythfrontend setup menu to adjust the dimensions.  While it did
>     help a bit, the display is still too large.  I'm hoping a custom
>     modeline might help.
>
>     Mythbuntu 12.04
>     Mythtv 0.27
>     nVidia GT520 using 304.88-0ubuntu0.0.3 drivers
>
>     -Robert
>
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>
>
> I noticed your using Nvidia and having the overscan issue. I too have
> this issue on two generic tv's that changing the zoom does nothing and
> they do not have a game ports. The overscan also happens on both hdmi
> and dvi. The solution I found that works over the past several years
> is to use the viewport command in Nvidia. The following is one example:
>
> nvidia-settings --assign 0/CurrentMetaMode="DFP-1: 1920x1080 {
> ViewPortOut=1864x1046+28+17, ViewPortIn=1920x1080 }"
>
> Use the above as a guide to adjust the current tv so that it will show
> the whole desktop.
> Key elements:
> DFP-1 - this is the assignment label for the tv that is in xorg log.
> 1920x1080 - tv resolution
> 1864x1046 - adjusted resolution that fits the desktop to the tv
> +28+17 - these values are 1/2 of the difference of the vertical and
> horizontal meaning...if you take for example the horizontal,
> 1920-1864=56 then divide that by 2, 56/2=28
>
> After you use this command in terminal and get the correct size then
> add it to your xorg.conf.
>
> Section "Screen"
>     Identifier     "Screen0"
>     Device         "Device0"
>     Monitor        "Monitor0"
>     DefaultDepth    24
>     Option         "Stereo" "0"
>    
>     SubSection     "Display"
>         Depth       24
>     Modes       "1920x1080"
>     EndSubSection
>
>     Option "metamodes" "DFP-1: 1920x1080 {
> ViewPortOut=1864x1046+28+17, ViewPortIn=1920x1080 }"
> EndSection
>
> Also look for this on google.
>
>
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I too have a mythtv system running an NVidia graphics chip.  I used the
NVidia graphics tool nvidia-settings to get the EDID from the HDMI
connected TV and used this in xorg.conf.  I recall the EDID has all the
info re screen size, dpi etc and xorg will use this if specified in the
config file.  Take a look at:
http://wiki.xbmc.org/index.php?title=Creating_and_using_edid.bin_via_xorg.conf. 
I know this is xbmc but the principles are the same.  If this doesn't
fix the overscan then David's suggestion sounds interesting (I didn't
know you could do this, although I don't think I have the problem, will
investigate some time)
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