I'm moving a conversation started here: http://www.avsforum.com/avs-vb/showthread.php?t=1306256
because this seems to be an issue with my TV, not the computer nor the receiver.
I have an LA40A450. Have had a computer hooked up to it (via my Onkyo TX-SR606 receiver over HDMI) for about 6 months now. Ever since I hooked it up, it's looked a tad fuzzy, almost like the the resolution wasn't the one native to the screen. It was unnoticable during movies, but when there was text on screen (file browsers, etc.) everything just looked a little bit off.
I did a little reading online a few days ago and realized that despite being a 720p set, the resolution wasn't 1280x720, but 1366x768. Ah-ha! I thought. That's why things have looked funky. I changed the resolution on the computer to 1360x768 (1366 wasn't an option for some reason) and it made no clarity difference.
I then tried to plug the computer straight into the TV, and BAM, crystal clear! At this point I had figured it was the receiver messing it up, and I was grumbling about having to ruin my nice, simple setup to get a better picture, but it was ok.
Then, I opted to switch the computer to HDMI1 and the receiver to HDMI2 since the computer would be used most often and it just made more sense in my mind. And wouldn't you know, the computer plugged directly into HDMI1 had the clarity issue again. Then I plugged the computer back into the receiver and plugged the receiver into HDMI2 on the TV. Even running through the receiver, it was crystal clear.
HDMI1 has a lot more settings to goof around with (color / tint, entertainment modes, etc.), whereas HDMI2 seems pretty stripped down. Windows 7 reports that when plugged into HDMI1, the ideal resolution is 1280x720, but when it is plugged into HDMI2 the ideal is 1360x768.
Does anyone know what on earth the TV is doing to video on HDMI1 to make it work that way? It's not a big issue as I'll just used HDMI2 from here on out, but I'm really, really curious just to know a technical explanation (and if, perhaps, there is a way to change this). I certainly wouldn't mind having my video feed have all the adjustments possible available to it, but not at the expense of lesser clarity / focus overall with the PC.