[mythtv-users] HDTV, modelines, overscan, and DVI
Preston Crow
pc-mythtv05 at crowcastle.net
Sat May 7 02:56:54 UTC 2005
I'm connecting to my HDTV with a DVI connection, and it has significant
overscan that I can't control. I'm currently running it in 720p:
Modeline "720p" 74.25 1280 1312 1592 1648 720 735 742 757
When X starts up, the log file tells me:
(**) NVIDIA(0): Mode "720p": 74.2 MHz, 45.1 kHz, 59.5 Hz
This should be 59.94, not 59.5, right? (I know that ATSC is supposed to
support a number of different versions of 720p, including 50Hz, 59.94Hz,
and 60Hz, according to Wikipedia, but local broadcasts are 59.94Hz, so
that's what I want.)
My next issue is the overscan. I've been dealing with this by setting
the GUI size and offests in Myth's appearance setup screen. The numbers
work out as: 1152x672+64+25. The downside of doing this is that I
don't have a good way of telling things like MythGame to run with those
dimensions. So I found Jarod Wilson's page:
http://wilsonet.com/mythtv/mythhd.php
He explains how you can create a modeline that has the same timings, but
only has a subset of the lines, so I created an 1152x672 mode that
should have done the trick, but apparently using a DVI connection, that
trick doesn't work. The Myth GUI stretches off the screen just as the
original did. Am I correct that this trick is hopeless with DVI?
--PC
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