>>> But at some point the 1s and 0s must be converted to some sort of an >>> analog signal if only right behind the diode. A diode must be >>> presented with a signal in some sort of analog form in order to >>> illuminate, right? Digital is just a figment of our imagination after >>> all. >> >> The pixel is either on or off. There's no way to make half of the adjacent >> pixel on (and the other half of that pixel off). > > Well, couldn't the digital information for a particular pixel mean > blue, and the D/A mechanism attempts to create an analog signal that > the diode would interpret as blue, but the D/A converter or the analog > signal or the analog diode is affected by electric interference (which > traveled from the computer to the TV along the HDMI cable) and the > diode illuminates light blue instead of blue? > >> Having said that, you may be on the right track. I hadn't looked at your >> photo before, so sorry for that, but it indeed looks like your telly may be >> doing some scaling on the image. >> >> Check for overscan / underscan settings in the TV's menus and on the remote. >> The button for overscan may not be at all obvious on the remote from the >> icon that labels it - if you can't find a button on the remote that resolves >> this issue, or a overscan setting in the TV's menus then check the manual. >> >> Overscan would cause this symptom, and it is such a common feature, that IMO >> you shouldn't pst back here again until you've identified it on your TV and >> checked it. > > You may be right about this. I can select the following aspect ratios > on my TV's menu: > > 16:9 (this causes all 4 edges of the screen to be cut off) > Just Scan (this is what I use and it fits perfectly on the screen) > Set By Program (same as 16:9) > 4:3 (same as 16:9 except with black boxes on the left and right) > Zoom (same as 16:9 except more of the image is cut off) > Cinema Zoom 1 (same as Zoom except nothing is cut off from the top of the > image) > > I set 1920x1080 in xorg.conf but I just tried defining no resolution > at all and it seems to have been set anyway: > > (II) RADEON(0): Output HDMI-0 using initial mode 1920x1080 > > The TV is an LG 47LH90 and and it is said to do 1080p. I looked for > ghosting in 16:9 mode instead of Just Scan mode and strangely the > shadows are there, but they're oriented top and bottom instead of left > and right. I can take another photo if anyone would like to see. > > Why do I need to select Just Scan in order to prevent all 4 edges of > the screen from being cut off? > > - Grant
BTW I think you're on to something Stroller because the overall picture is definitely improved in 16:9 mode compared to Just Scan mode. I just need to figure out how to prevent the edges of the screen from being cut off. - Grant
