No problem! I asked about which connection you'd be using because that issue may not exist if you are running HDMI from the DirecTV receiver to the 805. The C-Net wording seemed specific to the issue occurring with component video.
For the manual on the 805, you can download it from Onkyo's support page (their support menu has a drop-down list that includes owners manuals). The direct link to the 805 manual is
here. Be careful, though - that's the combined manual for the 805 and 875, and the 875 has more video processing. In particular, there is a table showing selectable output resolutions for HDMI, but that is for the 875 and not for the 805.