[mythtv-users] Modelines

[Kenni Lund]

On 2014-01-27 Mike Perkins <mikep at randomtraveller.org.uk> wrote:
> On 27/01/14 13:50, Robert Dege 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
>>
> Since HDMI is all digital there should be nothing to configure in xorg, it
> "just works".
>
> There is an overscan issue which can usually be resolved by digging through
> your TV setup menus. It might be called something like "PC Game Mode".
>
> If your TV has more than one HDMI input you might try all of them. One of
> our TVs had different options for some of the inputs (ie "Game Mode"/"PC
> mode"/Exact Scaling"/whatever) was only available on HDMI2.

Exactly, and also remember to check the zoom-levels of the TV if the
above doesn't help.

If trying the other HDMI-connectors on the TV and changing the TV
configuration doesn't help, the mode lines from the JudderFree guide
serves as a good starting point:
http://www.mythtv.org/wiki/User_Manual:JudderFree#The_pain_with_TVs_reporting_incomplete_EDID

I've copy-pasted my own xorg.conf to pastebin, which you can use for
inspiration or perhaps copy-paste directly. I use it for my Mythbuntu
12.04 frontends with Nvidia graphics and 1920x1080 TVs, so it's likely
very similar to what you want to achieve:
http://pastebin.com/raw.php?i=VuD0T2Rh

On 2014-01-27 15.51 "Raymond Wagner" <raymond at wagnerrp.com> wrote:
> The screen setup wizard will let you exactly match MythTV's UI to you display.  The only reason you should need to tinker with modelines is if you're using applications outside of MythTV.

Another reason to tinker with modelines, rather then using the screen
setup wizard is to get 1:1 pixel mapping or to get judderfree playback
by utilizing refresh rates which aren't announced by the TV. I would
personally only use the screen setup wizard as a very last resort,
when all other posibilities have been eliminated. I have yet to come
across a LCD/LED TV which couldn't be fixed with prober mode lines in
combination with a correctly configured TV.

Best regards
Kenni