I can't speak for that Pioneer, but when my 720p-native LCD RP gets a 1080p signal, it doesn't acknowledge it. It will transfer, upconvert, or downconvert (as the case may be) 480i, 480p, 720p, or 1080i. Feed it 1080p and it simply won't show anything.
Both my 1080p-capable Oppo and 1080i max Toshiba HD DVD player have adjustable resolution in players' setup menus. I set 'em both to 1080i. If I set the Oppo to 1080p, my TV gets confused until I set the Oppo to something it can read.
Both my 1080p-capable Oppo and 1080i max Toshiba HD DVD player have adjustable resolution in players' setup menus. I set 'em both to 1080i. If I set the Oppo to 1080p, my TV gets confused until I set the Oppo to something it can read.