It's a Sony HS series, with component-only for HD input (no DVI). I had been using a Dish 6000 for many years without any complaints about relative picture darkness on the set's various SD and HD inputs. Now it seems that I have to boost the brightness considerably when using HD input from the 811. Unfortunately, the brightness setting seems to apply to all inputs, so I have to manually adjust each time I switch from HD viewing to SD programming (which looks so much better via S-video).
Certain HD programming tends to be darker than others. Video source material is generally OK, but film based uses lots of dark shadow. Last night's Six Feet Under was really dark on my set with the 811.