[mythtv-users] OT - aspect ratio and non-square pixel display

[Jeremy Jones]

On Mon, May 20, 2013 at 6:59 AM, Michael T. Dean <mtdean at thirdcontact.com>wrote:

> On 05/20/2013 05:12 AM, Jeremy Jones wrote:
>
>> On May 19, 2013 10:29 PM, "Michael T. Dean" wrote:
>>
>>> On 05/19/2013 10:45 PM, Jeremy Jones wrote:
>>>
>>>> Hi,
>>>>
>>>> I have an older wide screen (16:9) plasma with a native resolution of
>>>> 1024x768.  It will accept a resolution of 1280x720, but it overscans.
>>>>  In
>>>> the past I just used a setting in the nvidia driver to compensate for
>>>> the
>>>> overscan. At some point that feature of the driver went away. My system
>>>> defaulted to the native resolution of 1024x768 and myth has been
>>>> treating
>>>> the display as a 4x3 screen.  I set out to fix this this weekend and
>>>> found
>>>> a page on the MythTV wiki that explained how to set the aspect ratio
>>>> using
>>>> displaysize in the coefficient.conf file.  Trouble is adding that line
>>>> has
>>>> no effect.  It seem that the setting is controlled somewhere else.  I'm
>>>> running mythbuntu 12.04.
>>>> Anyone know what could be overriding that setting?
>>>>
>>>>  coefficient.conf?
>>>
>> Xorg.conf
>> I should really proofread better when using my phone for typing email.
>>
>>  You need to either set the DisplaySize in X or set the resolution and DPI
>>> and let X calculate the display size, so it can calculate the physical
>>> aspect ratio.
>>>
>>>
>>> http://www.mythtv.org/wiki/**Display_Size<http://www.mythtv.org/wiki/Display_Size>
>>> http://www.mythtv.org/wiki/**Specifying_DPI_for_NVIDIA_**Cards<http://www.mythtv.org/wiki/Specifying_DPI_for_NVIDIA_Cards>
>>>
>> Yep. That's the page I followed.
>>
>>
>> The displaysize line in X had no effect. I think something else is
>> overriding it, but I can't figure out what.
>>
>>
> Yes, most distros--in their quest to "help" you by making X
> config-file-less so you don't have to write a config file--do fun things
> like hard-code a -dpi setting on the command line used to start X, which
> tells the server to completely ignore any configuration-file specified
> DisplaySize values and even driver-specific configuration-file values such
> as DPI (and also makes the DPI meaningless).  And, to make matters even
> more fun, different distros have different ways of starting X, so finding
> that -dpi can be a challenge (some may put it into the startx script,
> others call startx -- -dpi 100 or similar from some other script and others
> use other mechanisms).
>
> It's possible something like this is overriding your configuration.
>
>
> Mike
>

Thanks Mike. That info helps. Since my distro is Mythbuntu, I think I will
re-post this on the Mythbuntu mailing list with a significant edit since
know I know better what I am looking for.

Thanks,

Jeremy
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.mythtv.org/pipermail/mythtv-users/attachments/20130520/db67b9ac/attachment.html>