[mythtv-users] How to fix overscan through Onkyo Receiver

[Jim Berwick]

Hopefully someone can point me in the right direction.  I formerly had 
one of my myth boxes attached directly to my Vizio VP42 TV through VGA 
with a 1360x768 resolution on an Nvidia GT210 graphics card.  This 
worked perfectly with no overscan.

I just put in an Onkyo TX-SR608 receiver (replaced an older Onkyo that 
had no HDMI/VGA connectivity) and now I have terrible overscan in 
MythTV.  The Onkyo notes it is outputting to the TV over HDMI at 
1280x720p and all other content (bluray player over HDMI, PS2 over 
composite, Wii over component) is being scaled to the correct size with 
no overscan.

I've tried both VGA and DVI connections to the receiver from the myth 
box and in both cases the resolution gets detected as 1280x720 but 
things are just slightly too big (I have to change the overscan 
compensation in the nvidia driver from 0 to around 80 before the 
lefthand side of the screen is entirely there, and to over 140 to get 
the rightmost part of the screen entirely onboard which leaves an even 
larger gap on the left).

I've tried different resolutions (both on the receiver and myth box), 
but nothing makes it look quite right.  Since the other systems look 
correct over HDMI (and Myth does bypassing the receiver via VGA or HDMI 
to the TV directly), I have to assume the problem isn't the TV...

Can anyone give me a push in the right direction here other than go back 
to VGA directly to the TV and having to fumble with two input switches 
to watch TV again?