We have a issue while using ADV7842 as encoder for graphics input via both VGA and DVI. The output for 1280x960@60Hz, 1280x1024@60Hz and 1680x1050@60Hz inputs is wrapped around at the right edge of the screen. The shift is briefly 1/4 to 1/3 active picture wide.
Through our test, we have determined that it is most likely the H sync start position got shift rightwards which caused the issue. We tried to change START_HS and END_HS but with no effect on video. Chip prime mode is set to graphics. Standard is set to auto. MAN_PARAM is set. Attempt of changing start/end of both VBI and SAV are successful.
Have anyone ever ran into this? If so, how did you tweak the H sync start position?