[mythtv-users] overscan problems with nvidia 8400 GS

Tom Dexter digitalaudiorock at gmail.com
Sun Jul 5 23:33:00 UTC 2009

On Sun, Jul 5, 2009 at 2:04 PM, Daniel Kristjansson<danielk at cuymedia.net> wrote:
> On Fri, 2009-02-20 at 15:41 -0800, Allen Edwards wrote:
>>         Is there a way to use nvidia's normal overscan settings with
>>         the 8400gs? Or if I adjust the screen size with mythtv screen
>>         setup, how do I make it so the gnome panel isn't on top of
>>         mythtv?
>> The documentation is wrong and TVOverScan no longer works in xorg.conf
> It isn't so much that the documentation is wrong, it's that none of
> the newer cards support that feature. Instead you need to construct a
> custom modeline via one of the various modeline tools out there.
> This is the same procedure we all had to do for CRT's back in the
> early 90's with XFree86, you can even blow up some old TV's just like
> in the old days before computer monitors had safety circuitry added.
> -- Daniel

I've always had overscan on my RP CRT TV...maybe 5% or more.  I have
no more in MythTV than I have with commercial devices such as my
Samsung HD receiver.  Someone correct me if I'm mistaken, but I've
never attempted to address it for this reason:

I'm sending 1080i video to my TV (which is a native 1080i display).
It seems to me that if I compensate for overscan in any way (with the
possible exception of fixing it in the TVs service menu, which
apparently can only reduce it a small amount), it _must_ degrade video
quality, as it must resize the video in some way.  Am I missing
something there?

I do of course have the menu screens resized in MythTV to fit
correctly, and I've tweaked a few positions of things in my OSD, but
I've left the video alone.


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