[mythtv-users] So close, but not quite - a 1080i modeline for my HDTV CRT

Sasha Z kleptophobiac at gmail.com
Sat Jun 3 20:19:48 UTC 2006


On 6/3/06, Matt Mossholder <matt at mossholder.com> wrote:
> No, it just doesn't work the way you have it configured.  The EDID
> information is showing you that the ACTUAL resolution is 1920x540...
> PROGRESSIVE. But the mode that you want to use is actually 1920x1080
> interlaced. The two modes are identical, except with regards to the
> information in the stream. One has a single 1920x540 screen of
> information every cycle, and the other has a single 1920x1080 screen
> every TWO cycles, with every other frame carrying either the odd or even
> lines.
>
> What you are seeing, though, is something different. What you have is
> the TV displaying at 1920x1080i, but within that, it is constraining the
> display to 1920x540i, based on the modeline you gave it. That is why in
> your original message, the logs showed the resolution as 1920x1080, but
> the bounding box as 1920x540. So what it was doing was running the
> display at 1920x1080, but only displaying in the middle 540 lines.
>
> Another thing to try would be doubling each of the last 4 numbers in the
> modeline, so that it is based on 1080, rather than 540. Like this:
>
> Modeline "1920x1080i"   74.25 1920 2008 2052 2200   1080 1082
> 1094 1128 +hsync +vsync interlace
>
> >From my experience, though, letting EDID run things works best.
>

I tried both that ATSC modeline and the doubled modeline, and the CRT
refused to sync to them. I just got a black screen. Is there some way
to use that EDID produced modeline while forcing the bounding box
bigger?

Thanks!
--Sasha


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