1024 x 768 widescreen DPI or Display Size settings

According to Amazon, it's a 720p set, so its maximum resolution should be 1280x720. I drive my 40" Sony (LCD, not plasma) at that resolution with the NVIDIA control application. (My TV supports 1920x1080, but my eyes don't!) I'd stick with using the NVIDIA app unless you like mucking around with xorg.conf.

That said, I have problems with the dot pitch when I use this TV and Kubuntu. After installation I have to add an

Options "DPI" "100x100"

line in the Monitor section of xorg.conf. Otherwise the text on my screen is miniscule. I'm guessing this is some type of handshake issue where the installer can't determine the proper display characteristics (even though the Sony has a valid EDID).

In the past when I had an NVIDIA 6600 with both VGA and DVI, I could drive the screen at 1280x720 using either method. Now I have a 9500GT which has only DVI, so I use a DVI<>HDMI cable. Works fine. It appears your TV only has HDMI connectors, so you'll be using the second approach.

Hope this helps.

I looked up that set and it's native resolution is 1024x768 (which means it uses rectangular pixels). Most sets that say they are 720p just means that have a native vertical resolution of 720 or 768 pixels. They take 1280x720 as an input (and often 1920x1080i) but scale it down to its native res of 1024x768 (so you'll lose a little horizontal information in picture but it will look like 720p). My plasma has a native resolution of 1024x768, but I'm passing it 1280x720 (it should be fairly well optimized to take that resolution for TV signals, since that's what set top boxes will send it). I know I didn't set DPI in xorg - I have to look at nvidia settings - but as your are using ATI, I'm not sure how to help - I avoid ATI like the plague.

What resolution are you passing through?